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Liquid water on Mars, athletic performance in transgender women, and the lost colony of Roanoke

Science Podcast
illustration of the baptism of Virginia Dare
Henry Howe

Billions of years ago, Mars probably hosted many water features: streams, rivers, gullies, etc. But until recently, water detected on the Red Planet was either locked up in ice or flitting about as a gas in the atmosphere. Now, researchers analyzing radar data from the Mars Express mission have found evidence for an enormous salty lake under the southern polar ice cap of Mars. Daniel Clery joins host Sarah Crespi to discuss how the water was found and how it can still be liquid—despite temperatures and pressures typically inhospitable to water in its liquid form.

Read the research.

Sarah also talks with science journalist Katherine Kornei about her story on changing athletic performance after gender transition. The feature profiles researcher Joanna Harper on the work she has done to understand the impacts of hormone replacement therapy and testosterone levels in transgender women involved in running and other sports. It turns out within a year of beginning hormone replacement therapy, transgender women plateau at their new performance level and stay in a similar rank with respect to the top performers in the sport. Her work has influenced sports oversight bodies like the International Olympic Committee.

In this month’s book segment, Jen Golbeck interviews Andrew Lawler about his book The Secret Token: Myth, Obsession, and the Search for the Lost Colony of Roanoke.

Next month’s book will be The Book of Why: The New Science of Cause and Effect by Judea Pearl and Dana Mackenzie. Write us at or tweet to us @sciencemagazine with your questions for the authors.

This week’s episode was edited by Podigy.

Download a transcript of this episode (PDF)

Listen to previous podcasts.

[Image: Henry Howe; Music: Jeffrey Cook]


Sarah Crespi

Sarah Crespi is the Senior Multimedia Producer at Science and host of the Science Magazine Podcast.

Daniel Clery

Daniel is Science’s senior correspondent in the United Kingdom, covering astronomy, physics, and energy stories as well as European policy.

Katherine Kornei

Katherine Kornei

Katherine Kornei is a freelance science writer based in Portland, Oregon.  

Jen Golbeck

Jennifer Golbeck

Jennifer Golbeck is a professor at the University of Maryland in College Park.

Andrew Lawler

Andrew Lawler

Contributing Correspondent Andrew Lawler is based in Asheville, North Carolina. His most recent book is The Secret Token: Myth, Obsession, and the Search for the Lost Colony of Roanoke.