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If natural selection is constantly ridding lineages of detrimental traits, why do all organisms wear down with age? Why does restricting the diet slow down the aging process?

On this episode of Big Biology we talk with Jenny Regan and Dan Nussey, scientists at the University of Edinburgh who study why some organisms age at different rates and what phenotypic plasticity might have to do with this with variation.

We discuss how aging happens, why species vary, and some of the major theories scientists use to explain it. We also discuss a paper that Jenny and Dan recently published in Functional Ecology, which proposes an evolutionary explanation for the life-extending effects of diet restriction. Their idea is that mechanisms that evolved to coordinate phenotypically plastic responses ultimately underpin aging.

Read Jenny and Dan’s recently published Functional Ecology paper that describes why diet restriction has anti-aging effects.

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This is a free preview of a paid episode. To hear more, visit bigbiology.substack.com

What can direct-to-consumer genetic companies tell us about our health and ancestry? How do scientists figure out which genes affect particular traits? Is Art related to a Nigerian prince? Is Marty a Neanderthal? On this episode of Big Biology we talk with Samantha Esselmann and Ruth Tennen, product scientists at 23andMe, about how the company uses its massive trove of data to help people learn about the genetics of their ancestry and health. We talk about the accuracy of results and what the numbers in their reports say about us. Samantha and Ruth work closely with 23andMe’s population geneticists and content writers to develop engaging scientific content for 23andMe's health reports and educational initiatives. Samantha has a PhD in Neuroscience from UCSF. Ruth got her PhD in Cancer Biology from Stanford and served as a science policy fellow at the State Department.

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How important are pathways other than DNA for transmitting traits from one generation to the next? On this episode of Big Biology, we talk to neuroscientist Frances Champagne from the University of Texas at Austin. Using rodents, Frances studies how early-life experiences affect epigenetic marks and how those marks are passed from one generation to the next. We asked her how those marks influence rat behaviors, why this mechanism alters modern evolutionary theory, and whether the growing interest in epigenetics is vindicating Lamarck’s old ideas about the inheritance of acquired characteristics.

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How do new species form? How long does it take for evolution to happen? What can hybrids tell us about the process of speciation?

On this episode we talk with Peter and Rosemary Grant, two Princeton biologists who spent decades studying finches on the Galapagos Islands. Their work on bird beaks provides some of the strongest evidence for how fast natural selection can occur and more recently the genes involved. Their newest work on hybridization could fundamentally change how we think about speciation in animals.

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Why did conventional thinking in aerodynamics fail to explain how insects fly? What can robots teach us about how insects do it? How do insect brains direct their incredible aerial feats and get around in the world? Michael Dickinson is a biologist at Caltech who uses robots to study how insects fly. More recently, he has focused on insect neurobiology and behavior. On this episode, Art and Marty talk with Michael about the mysteries of tiny insect flight, and how the presumably simple brains of such animals enable them to navigate sometimes vast distances.

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How does a tiny insect migrate thousands of miles from Canada to Mexico each year? What does the decline of monarch butterflies tell us about the ecological health of our continent? How are scientists using gene editing to understand how insects have evolved to tolerate poisonous plants? Anurag Agrawal is a biologist at Cornell University who studies plant-insect interactions, including monarch butterflies. He is the author of a new book called "Monarchs and Milkweed: A Migrating Butterfly, a Poisonous Plant, and Their Remarkable Story of Coevolution.” On this episode, Art and Marty talk with Anurag about the incredible migration of the monarch butterfly, the recent decline in population and a fascinating study where scientists edited the genomes of fruit flies to make them resistant to a poisonous plant that monarchs eat.

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What does neuroscience have to say about morality, politics, and cross-cultural communication? How are neurobiology and philosophy connected? Pat Churchland is a neurobiologist and philosopher at UC San Diego, where she has spent years studying connections between mind and brain. Tune into this episode to hear Marty and Art discuss these questions as well as Pat's new book "Conscience: The Origins of Moral Intuition."

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Why hasn’t natural selection eliminated human diseases? Are bad feelings like anxiety and depression adaptive? Can we use evolutionary biology to improve medicine? Randy Nesse is a doctor and a scientist at Arizona State University who uses evolutionary biology to inform the practice of medicine. In his latest book, “Good Reasons for Bad Feelings,” he discusses how natural and sexual selection may have shaped our psychological and emotional lives. On this episode Art and Marty talk to Randy about evolutionary psychiatry.

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Why are animals loud and conspicuous when that increases their risk from predators? How does noise pollution affect mating behaviors? How can robots help biologists study complex topics such as sexual selection and mate choice?

Gail Patricelli is a behavioral ecologist at UC Davis, where she studies how individual variation in animal signaling and communication affects mate choice and reproductive success. Gail uses robots to investigate the process of sexual selection in sage-grouse and other species with elaborate mating displays.

Tune into this episode to hear Marty and Art talk to Gail about these topics and more!