Down the Wormhole

Episode 130 In part 23 of our Sinai and Synapses interview series, we are talking with Dr Fred Ledley. He is a professor of natural & applied science and management at Bentley University in Waltham, MA and director of the center for integration of science and industry. A physician and pediatrician by training, he has performed research in genomics on the faculties of the Baylor College of Medicine, Texas Children’s Hospital, and Howard Hughes Medical Institute and founded several biotechnology companies focused on gene therapy or personalized medicine. A widely published researcher, his current work focuses on advancing the translation of scientific discoveries for public value by developing synergies between science, medicine, business, and public policy. He has previously participated in the national, NIH-funded program in “Genetics, Religion and Ethics”, part of the ELSI program of the Human Genome project, and a Templeton-funded program “New Visions in Science, Nature and Religion” at US Santa Barbara. He has written a novel, Sputnik’s Child, which explores how science and technology became a faith for members of the baby boom generation and the limits of this faith. He plays clarinet in Shpilkes Klezmer Band and has served on the board of the Boston Jewish Music Festival, Jewish Arts Collaborative, and Celebrity Series of Boston. He joined in a Bnai Mitzvah with his wife, Tamara, at age 31, occasionally reads Torah and serves as darshan as a member of Temple Aliyah in Needham MA, and considers music, hiking the forest, and observing solar eclipses to be spiritual experiences. Check out his book, "Sputnik's Child" here - https://amzn.to/4dgiZAD Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 129 Why do smart people believe dumb things? We unpack cognitive biases, like how judges might deny parole just because they're hungry (or maybe not?). Learn why Steve Jobs wore black turtlenecks, why knowing a little Greek makes pastors dangerous, and why acknowledging your biases doesn't make you immune to them. Plus, we touch on misinformation, trusting experts, and why sometimes, the best advice is to stop learning stuff. It's bias all the way down! Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 128 In part 22 of our Sinai and Synapses interview series, we are talking with Dr Ciara Reyes-Ton. She is a biologist, science writer, and editor who is passionate about science communication to faith communities. She has a Ph.D. in Cell & Molecular Biology from the University of Michigan. She has served as Managing Editor for the American Scientific Affiliation’s God & Nature Magazine. She is currently the Digital Content Editor for BioLogos and an Adjunct Professor at Lipscomb University. She also recently helped found the Science Communicators of Faith (SCF), a group dedicated to providing a supportive, collaborative, and Christ-centered community for people of all backgrounds and skill levels to grow in the craft of science communication. She is also the author of “Look Closely,” a science and faith devotional that explores the life of Christ by bringing scripture in conversation with science, from water-walking lizards to dividing cells and resurrecting corals. Outside science, she has a heart for worship and is a proud mom. https://www.mountcarmell.com/ Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 127 In part 21 of our Sinai and Synapses interview series, we are talking with Rabbi Dr Jack Shlachter. Jack Shlachter is a physicist who worked at Los Alamos National Laboratory for over thirty years with briefer stints at Brookhaven National Laboratory in New York, the Atomic Energy Agency, and the Comprehensive Test Ban Treaty Organization, the latter two based in Vienna, Austria; he led both the Physics Division and Theoretical Division during his LANL career. In parallel, Jack is an ordained rabbi who led the Jewish congregation in Los Alamos for many years, was the rabbi in Center Moriches, NY, during his years at Brookhaven, and now serves as rabbi of HaMakom, a congregation in Santa Fe, NM as well as the Los Alamos Jewish Center. He has also provided itinerant rabbinic support to far-flung Jewish communities including those in Vienna, Austria, Beijing, China, and Warsaw, Poland. Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 125 This conversation was recorded at the Sinai and Synapses alumni gathering in November 2023. In it, we talk with Dr. Briana Pobiner about the earliest cannibals, fad diets, and what life was like for our paleolithic predecessors. When you're done with this episode, make sure to check out her other interviews as well! https://www.downthewormhole.com/e/human-origins-part-1-with-briana-pobiner-big-questions-and-little-bones/ https://www.downthewormhole.com/e/elevating-the-discourse-with-briana-pobiner-paleoanthropologist/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 125 In part 21 of our Sinai and Synapses interview series, we are talking with JD Stillwater. He is a science ambassador and author who writes and speaks about profound insights from natural reality, insights that drive paradigm shifts, and cultural awakening. He is an officer of the Religious Naturalist Association, and serves on the governing Council of the Institute on Religion in an Age of Science. JD Stillwater - https://www.jdstillwater.earth/ Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 124 We're back! After over two years, we have recorded a new episode, but it's better than that. We've actually recorded a couple of new episodes with a plan in place to record dozens more. Oh, and we have a whole host of interviews lined up with fascinating people that we know you will love. It feels more important than ever to be able to talk about science and religion, and we can't wait to continue this journey with you. In the meantime, we thought it might be fun to talk about what we talk about when we talk about science and religion. Is that the most confusing possible way to say that? Probably, but it works. So join us for a conversation that touches on wonder, trauma, politics, miracles, and unexpected pathways to the divine. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 123 This conversation was recorded at the Sinai and Synapses alumni gathering in November 2023. In it, we talk with Dr. Muhammad Aurangzeb Ahmad about the ethics of AI in Islam, the future of human-computer interaction, and the ethics of bringing a form of consciousness back to life. Muhammad Aurangzeb Ahmad is a Research Scientist at University of Washington’s Harborview Medical Center and an Affiliate Assistant Professor in the Department of Computer Science at University of Washington Bothell. His research focuses on algorithmic nudging at scale, simulation modeling for machine learning, Responsible AI, and personality emulation. He has had academic appointments at University of Washington, Center for Cognitive Science at University of Minnesota, Minnesota Population Center, and the Indian Institute of Technology at Kanpur. Muhammad also has worked in applied AI in industry for several startups and advisor to various governmental bodies. He has a PhD in Computer Science from the University of Minnesota. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis 9bi2pvCS8hJHF73c6ylI RV4OTIqNAXnB5lL73y59

Episode 122 Today we are joined by author, speaker, and podcaster Rob Bell to talk about his new novel "Where'd You Park Your Spaceship". We talk about delighting in our work, a faith that could survive the end of the world, and how a book about spaceships and distant planets has more to do with what it means to be human than anything he's written before. Rob Bell is the New York Times Bestselling author of fourteen books and plays which have been translated into 25 languages. His visual art can be seen on Instagram @realrobbell, his band is HUMANS ON THE FLOOR, and his podcast is called The RobCast. Rob lives with his family in Ojai, California. https://robbell.com/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis Transcript (AI Generated) Zack Jackson (00:22.558) Our guest today is the bestselling author of 14 books and plays, international speaker and host of the Robcast. orb (00:30.161) Okay. Zack Jackson (00:46.582) He lives in Ojai, California, where he hosts two-day small group gatherings, that which you can and should sign up for right now. Link in the description. It is my pleasure and honor to welcome Rob Bell to this podcast. Hey, Rob. Ian Binns (01:02.341) Hey Rob. orb (01:02.45) Hello, fellas. Thanks for having me on. Zack Jackson (01:05.322) Oh, thanks for spending your morning with us. So I have in my hand this very, um, strange and wonderful novel called where'd you park your spaceship? Which even I know the title still to this day brings a smile to your face. Um, the book starts with the line. Ian Binns (01:08.122) Yeah. orb (01:27.205) just to hear you say it, just to hear you say it. Ian Binns (01:30.62) I loved it. Zack Jackson (01:32.21) So the first line in the book is, the earth didn't make it, it got brown balled. Which in total caps, brown balled. Then we meet characters named Heen Grubears, Moogie Fallers and Sir Pong. There's a family game like two pages in where you intentionally slam your head into a fork. And then without any explanation, we have a sentence that says, We took her to the Thrival in our circle that night. So from like the very beginning of this book, I got the feeling that this wasn't going to be a book about a carefully crafted universe or a book about like a message being hammered on over and over again. This was not a carefully crafted universe. This was a novel just stuffed to the brim with delight. Like your absolute delight in your characters, in their alien world, it just comes through so clearly. Can you maybe just tell us a little bit about your relationship to the story and to the people who live in here? orb (02:45.69) What a wonderful setup slash question. Yeah, and honestly. Zack Jackson (02:48.226) Ha ha ha. orb (02:54.101) All I had was delight. I don't have training as a writer. I don't have a background. I haven't really read science fiction. I guess Hitchhiker's Guide to the Galaxy. I don't, other than that, I like, all there was, and my work for roughly 30 years has been explaining. That's what like a spiritual teacher does, which is a very particular engagement of the mind. And I had some sense that something was ending, something I'd been doing. It was like an achy, angsty, like a death feeling, like a cellular death. Like you've been doing a thing and it's coming to an end. Don't numb the pain, just let it die. And this story came roaring in. And the only way it worked was what happens next. Like a very innocent, tender, who appears? What are they wearing? What's their name? and that explaining energy. Well, obviously, if you watch a movie and it's clear what the point of the movie is, you're like, ugh, we say heavy-handed, on the nose. You know what I mean? We're out. So it was like taking all of these muscles that I've built up over the years. Like a number of my earlier books,...

Episode 121 Today we are joined by Dr. Chris Impey to talk about exoplanets, the search for life in space, and the search for meaning on Earth. Dr Impey is a University Distinguished Professor of Astronomy at the University of Arizona. He has over 220 refereed publications on observational cosmology, galaxies, and quasars, and his research has been supported by $20 million in NASA and NSF grants. He has won eleven teaching awards and has taught two online classes with over 300,000 enrolled and 4 million minutes of video lectures watched. He is a past Vice President of the American Astronomical Society, won its Education Prize, has been an NSF Distinguished Teaching Scholar, Carnegie Council’s Arizona Professor of the Year, and a Howard Hughes Medical Institute Professor. He has written 70 popular articles on cosmology, astrobiology and education, two textbooks, a novel called Shadow World, and eight popular science books: The Living Cosmos, How It Ends, Talking About Life, How It Began, Dreams of Other Worlds, Humble Before the Void, Beyond: The Future of Space Travel, and Einstein’s Monsters: The Life and Times of Black Holes. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis 9bi2pvCS8hJHF73c6ylI Transcript (AI Generated) ian (01:16.703) Our guest today is a university distinguished professor of astronomy at the University of Arizona. He has over 220 refereed publications on observational cosmology, galaxies, and quasars, and his research has been supported by $20 million in NASA and NSF grants. He's won 11 teaching awards and has taught two online classes with over 300,000 enrolled and 4 million minutes of video lectures watched. He's a past vice president of the American Astronomical Society, has been an NSF Distinguished Teaching Scholar, Carnegie Council's Arizona Professor of the Year, and a Howard Hughes Medical Institute professor. He has written 70 popular articles on cosmology, astrobiology, and education, two textbooks, a novel called Shadow World and eight popular science books. I'm very excited to welcome Dr. Chris Impey to the podcast today. chris_impey (02:07.898) Yeah, delighted to be with you. zack_jackson (02:09.75) Welcome. That's quite an introduction. Ha ha ha. Thanks for watching. I hope you enjoyed this video. I'll see you in the next one. Bye. ian (02:12.983) Yeah. Obviously, I shortened down what you sent us, and it was tough for me to do that, Chris, because you've done a lot. You know, obviously, I was at fellow academic. I understand the need to do peer-reviewed research and those types of things in our field, but I was really impressed with how much writing you've done for the general public, both articles and also your books. You've written a novel. You've been on several podcasts. Can you kind of tell us a little bit about your background, what is you do, and then how you also got into that part of your profession of making sure you communicate with the general public as well? chris_impey (02:53.298) Sure, you won't hear it in my voice, my accent, but I was born into Edinburgh, I'm a Scott. I had a little transatlantic childhood that sort of wiped out the Scottish borough, but if you feed me single malt whiskey it would come back. And of course, I'm sure you noticed if you've gone to Britain that you look up and there are not many stars visible there. So once I decided to do astronomy I knew I was going to leave, so I did my undergrad work in London. zack_jackson (03:04.15) Thank you. Bye. Ha ha ha! chris_impey (03:22.938) and never look back and I'm a dual citizen now. So astronomy is big in Arizona. I've not looked elsewhere. The grass is never greener anywhere else. We're building the biggest telescopes in the world and we have five observatories within an hour's drive. So this is the perfect place to do observational...

Episode 120 Today we are joined by Dr Emily Smith to talk about epidemiology, the dangers of truth telling, and how the story of the Good Samaritan changed everything for her. She is an assistant professor in the department of emergency medicine/surgery at Duke University and at the Duke Global Health Institute (DGHI). During the COVID-19 pandemic, she became known as the Friendly Neighbor Epidemiologist through her social media outlets which reached over 10 million people in 2020-2021. She continues posting on the social account and her Substack blog with a monthly reach of 2-4 million. Her work has been featured in TIME Magazine, NPR, the Washington Post, Christianity Today, and Baptist News Global. Before joining the faculty at Duke University, she spent four years at Baylor University in the department of public health and was a research scholar at DGHI for two years. She received her Ph.D. in epidemiology from the Gillings School of Global Public Health at UNC Chapel Hill and a MSPH from the University of South Carolina. She has been married to her pastor-husband for 20 years and they have two fantastic children, one spoiled golden retriever and a new very-friendly golden doodle puppy. Her debut book, The Science of the Good Samaritan: Thinking Bigger About Loving Our Neighbors, released on Oct. 24, 2023 from Zondervan. I’m very excited to welcome Dr. Emily Smith to the show today. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis AI Generated Transcript Ian (00:04.911) Okay. So our guest today is an assistant professor in the department of emergency medicines surgery at Duke university and at the Duke global health Institute. During the COVID-19 pandemic, she became known as the friendly neighbor epidemiologist through her social media outlets, which reached over 10 million people in 2020 and 2021. She continues posting on the social account and her sub stack blog with a monthly reach of two to 4 million people. Her work has been featured in Time Magazine, NPR, The Washington Post, Christianity Today, and Baptist News Global. Before joining the faculty at Duke University, she spent four years at Baylor University in the Department of Public Health and was a research scholar at DGHI for two years. She received her PhD in epidemiology from the Gillings School of Global Public Health at UNC Chapel Hill and MSPH from the University of South Carolina. She's been married to her pastor husband for 20 years and they have two fantastic children. one spoiled golden retriever and a newly and a new very friendly golden doodle puppy. Her debut book, the science of the good Samaritan thinking bigger, bigger about loving our neighbors released on October 24th, 2023. I'm very excited to welcome Dr. Emily Smith to the show today. Emily Smith (01:15.144) I'm very excited to welcome you all. Thank you for having me. It's a pleasure to be here for sure. Ian (01:21.518) Yeah. Um, as I was saying before we started recording, you know, I've found you because of your Facebook account and was just always amazed, obviously with your expertise in the science and, um, everything you were sharing, but also your lens as an evangelical Christian. Um, I thought that was really fascinating and trying to work with those two communities, right? Trying to kind of be a boundary, uh, spanning individual for that. But I think before we really get into that. Emily Smith (01:43.734) Yeah. Ian (01:50.162) I would love for you to just kind of talk to us a little bit about what drew you to epidemiology. Emily Smith (01:56.476) Yes, and prior to the pandemic, I don't think a lot of people knew what that word meant. By the way, it's seven syllables, and so throw that into a Thanksgiving meal or something if you need a big word to kind of wow family with. But, you know, people would get us...

Episode 119 Today, we are joined by paleontologist, Dr. Mary Schweitzer. She is professor in the department of biological sciences at North Carolina State University. She is also a research curator for paleontology at the North Carolina Museum of Natural Sciences. Her research interests include molecular paleontology, specifically the preservation and detection of original molecular fragments in well preserved fossil specimens. In 2005 she and her team shook the paleontology community when they reported finding soft tissue preserved in a 68-million-year-old T-Rex femur. Since that initial find, her team has unearthed mounting evidence that soft tissues, such as blood vessels, collagen and other proteins, can survive more than 66 million years of degradation. Fun fact, on one of her fossil hunts she spent three days in the field walking around on a broken leg because she didn’t want to miss out on anything. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 118 In part 20 of our Sinai and Synapses interview series, we are talking with the Rev Dr Vikki Gaskin-Butler. She is a licensed psychologist (clinical and health psychology) and ordained clergy person. She received her bachelor’s degree in psychology from Spelman College and her Master of Science and Ph.D. in psychology from the University of Florida. She also received a Master of Divinity degree from the Candler School of Theology at Emory University. She guest has served as a psychologist in university counseling centers, clinic director in an interfaith-based counseling center, and as director of a university psychology clinic. She has supervised numerous students in pursuit of psychology, mental health counseling, and social work degrees. She has led clergy consultation groups and served as a consultant with church/church-affiliated and secular organizations. In addition, she has served as a minister of education and an associate pastor in local churches. She draws on her knowledge of human potential from her experience as a psychologist and ordained clergy person to support the psychological, spiritual, and physical well-being of all people. Through her first-hand knowledge of life as a wife, mother, musician, professor, clinician, and minister, she has the insight to support the needs of adults, including performing artists, clergy, and health professionals. In her words: "My passion is to constantly move toward my own divine potential. Throughout this journey, I have experienced struggle, doubt, grief, joy, peace, and all of the emotions that make us human. These emotions and the experiences connected with them have made me more whole as I followed the thread of healing to freedom. These emotional experiences have also created within me a deep well of compassion for others as they journey on their paths to health and wholeness." You can listen to her last Down the Wormhole episode here... https://www.downthewormhole.com/e/womanist-psychology-of-religion-with-rev-dr-vikki-gaskin-butler/ Also be sure to check out her podcast and all her other work here... https://www.drvikki.org/ Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 117 Today, we are joined by the one and only Rev. Dr. Pamela Conrad. is the rector of St. Alban’s Episcopal Church in Glen Burnie, Maryland. She’s also an astrobiologist and planetary scientist specializing in understanding how planets do or do not evolve into habitable environments, and she is presently involved in the exploration of Mars with the Perseverance Rover and its companion, the Ingenuity helicopter. She has explored extreme environments all over the Earth including in the high arctic, Antarctica, Death Valley, and the deep sea hydrothermal vents of the Pacific sea floor, to name a few. We talk about life on other planets, cherishing life on this planet, the future of the church, the lessons we can learn from entropy, and so much more. Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 116 In part 19 of our Sinai and Synapses interview series, we are talking with Emily Gerdin. She was raised in two faiths growing up (Judaism & Protestantism), and her interfaith upbringing inspired her to study how minds are shaped by religious worldviews. She is a PhD candidate in developmental psychology at Yale University, studying how children conceive of religious groups as sometimes similar to other social categories in the world (e.g., race, gender, nationality) and sometimes very, very different. Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 115 In part 18 of our Sinai and Synapses interview series, we are talking with Dr Stephen Burgin. He is an associate professor of secondary science education at the University of Arkansas. His research interests focus on the authentic practices employed by professional scientists and how school science can more closely approximate that work. As an evangelical Christian preparing preservice secondary science teachers in the southern United States, Dr. Burgin is uniquely positioned to help his students and those he comes into contact with grapple with their relationship to both science and faith. Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 114 In part 17 of our Sinai and Synapses interview series, we are talking with Tyler J Fuller. Tyler is a Ph.D. student in the Graduate Program in Religion at Boston University. He is a sociologist of religion and a health educator. His research interests focus on the social scientific study of religion, health-seeking behaviors, and faith-based health education and promotion. Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 113 Today, we are joined by astronomer, author, speaker, and Director of the Vatican Observatory, Guy Consolmagno! We talk about asteroid mining, the ethics of renewable energy, alien spirituality, and why the Vatican has an observatory in southern Arizona. https://www.vaticanobservatory.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 112 In part 16 of our Sinai and Synapses interview series, we are talking with Dr. Richard Middleton. Dr. Middleton is Professor of Biblical Worldview and Exegesis at Northeastern Seminary in Rochester, NY. He is past president of the Canadian Society of Biblical Studies (2019–2021) and the Canadian-American Theological Association (2011–2014). His most recent book is Abraham’s Silence: The Binding of Isaac, the Suffering of Job, and How to Talk Back to God (Baker Academic, 2021). We talk about the freedom and wisdom that comes from letting the Bible be what the Bible is. What is the point of Job? Does God really need all that praise? How does paleoanthropology inform our reading of scripture? https://jrichardmiddleton.com/ Sinai and Synapses - https://sinaiandsynapses.org/ Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis

Episode 111 We're back! After an unannounced and unexpected hiatus, we are back with new episodes, interviews, and surprises. Today, we sit down with neurotheologian, research scientist, and best-selling author Dr. Andrew Newberg. We talk about the neurological mechanics of spiritual experiences, the origin of religion, psychedelics, mysticism, and the "infinite regressive doubt" that brings him spiritual peace. Don't miss this one! Support this podcast on Patreon at https://www.patreon.com/DowntheWormholepodcast More information at https://www.downthewormhole.com/ produced by Zack Jackson music by Zack Jackson and Barton Willis