The limits on human endurance, and a new type of LED

Science Magazine Podcast

Science Podcast

News, News Commentary, Science

4.3 • 842 Ratings

🗓️ 6 June 2019

⏱️ 21 minutes

🔗️ Recording | iTunes | RSS

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Summary

Cheap and easy to make, perovskite minerals have become the wonder material of solar energy. Now, scientists are turning from using perovskites to capture light to using them to emit it. Staff Writer Robert Service joins host Sarah Crespi to talk about using these minerals in all kinds of light-emitting diodes, from cellphones to flat screen TVs. Read the related paper in Science Advances. Also this week, Sarah talks with Caitlin Thurber, a biologist at Nassau Community College in Garden City, New York, about a hard limit on human endurance. Her group used data from transcontinental racers—who ran 957 kilometers over the course of 20 weeks—and found that after about 100 days, their metabolism settled in at about 2.5 times the baseline rate, suggesting a hard limit on human endurance at long timescales. Earlier studies based on the 23-day Tour de France found much higher levels of energy expenditure, in the four- to five-times-baseline range. Download a transcript (PDF) This week’s episode was edited by Podigy. Ads on the show: KiwiCo.com Listen to previous podcasts. About the Science Podcast [Image: N. Zhou et al., Science Advances 2019; Music: Jeffrey Cook] Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0	This podcast is supported by the Icon School of Medicine at Mount Sinai,
0:04.0	the academic arm of the Mount Sinai health system in New York City,
0:07.5	and one of America's leading research medical schools.
0:10.7	What are scientists and clinicians working on to improve medical care and health for women?
0:15.5	Find out in a special supplement to Science magazine prepared by the Icon School of Medicine
0:20.0	and Mount Sinai in partnership
0:21.6	with science. Visit our website at www.science.org and search for Frontiers of Medical
0:27.5	Research-Women's Health. The Icon School of Medicine at Mount Sinai, we find a way.
0:43.1	Welcome to the science podcast for June 7, 2019.
0:44.8	I'm Sarah Crespi.
0:48.7	In this week's show, we start with staff writer Robert Service.
0:51.4	He talks to me about a new type of LED.
0:56.2	This one uses the same special minerals called perovskites that have been catching on in solar energy. And I also talk with Caitlin Thurber about her paper from science advances
1:02.5	on what a 140-day transcontinental marathon can tell us about the limits of human endurance.
1:12.5	Now we have Robert Service, a staff writer at Science, and he's here to talk about perovskites,
1:18.9	which I'm sure I've heard once a week for the past five years, the word perovskites.
1:24.8	They have a lot of applications, and in this case, we're going to talk about
1:28.2	their use in LEDs in light-emitting diodes. But I typically hear them associated with solar energy,
1:35.9	right, Bob? We've written quite a number of stories about paravskites in the past, and
1:39.5	paravskites are a large collection of materials that share a common crystal structure. And these materials have
1:46.6	been exciting and very exciting for the research community in recent years because they've proven to be
1:51.7	very efficient solar cell materials. So they're really good at absorbing sunlight and then
	...

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