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In the growing field of nanotechnology, engineers are creating countless new microscopic materials. They're used in thousands of consumer goods, from cell phones to cosmetics and sunscreen. But how safe are they? To find out, we talked to Andrew Maynard, physicist and director of the Risk Science Center at the University of Michigan. We talked to him about the potential dangers of nanotech. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Major funding for "Making Stuff" is provided by the National Science Foundation. Additional funding provided by the Department of Energy. For more on nanotechnology, visit us online at pbs.org/nova/tech

Stopping signs of life and starting them again might seem like pure sci-fi—but cell biologist Mark Roth says it's very possible. In this podcast, he explains why. Podcast produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn about other ways that science is extending human life. Go to pbs.org/nova/sciencenow.

The next generation of spacecraft will travel faster than ever before. But they might not be propelled by rockets. If Dean Alhorn has his way, they'll be powered by light. Alhorn is an engineer at NASA's Marshall Space Flight center. He designs solar sails. They're basically big silver kites in space that are pushed along by the sun's rays. And Alhorn says they might change spaceflight in the very near future. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn about other new types of propulsion that NASA is testing, and how they might help us get to Mars. Go to pbs.org/nova/sciencenow

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, geologist Chris Goldfinger describes why earthquakes in one part of the globe might trigger others worldwide. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn more at pbs.org/nova

In this podcast hear how a newly identified wreck found outside of the harbor may rewrite the history of the Japanese attack. Produced by David Levin. Original interviews by Kirk Wolfinger. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn more at pbs.org/nova/killersubs

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, astrophysicist Neil deGrasse Tyson explains that despite all the doomsday claims on the Internet, the world will NOT end in 2012. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn more at pbs.org/nova/sciencenow

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, African-American chemistry pioneer Percy Julian gives his take on scientific language. Produced by David Levin and Susan Lewis NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn more at pbs.org/nova/julian

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, Native American geologist Alexandrea Bowman describes her path to science, which led from baby seals to Long Island Sound. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

If you could take a drug that could erase your memories, would you do it? It's not such a hypothetical question—neuroscientists have identified a drug that can wipe out memory in rats. It's not something that could be used on humans, but its existence raises a lot of big ethical issues. To sort those out, we talked to Art Caplan, director of the Center for Bioethics at the University of Pennsylvania. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn where the science stands on memory-erasing drugs, go to pbs.org/nova/sciencenow

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, biochemist Erika Ebbel describes how a mentor helped her transform into a scientist when she was 11 years old. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

In this podcast, NASA psychologist Al Holland discusses some of the the mental challenges astronauts might face during a mission to Mars. Podcast produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Find out how we might make it to Mars, and learn about the dangers we'd face along the way. Visit us at pbs.org/nova/sciencenow.

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, geologist Adrienne Block explains how she investigates mountains that lie beneath the humongous ice sheets of Antarctica. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, astrophysicist Neil deGrasse Tyson describes how the universe called him when he was nine years old. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, climate scientist Gavin Schmidt explains why the Earth needs to see a doctor… today. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

In the 1960s, a new theory surfaced that claimed Stonehenge was the work of ancient astronomers, and that its giant stone pillars were used to predict eclipses of the moon and sun. But was there anything to the idea? To find out, we talked to NOVA's senior science editor, Evan Hadingham. He trained as an archeologist and has written two books on Stonehenge. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn what motivated the builders of Stonehenge at pbs.org/nova/ancientworlds

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode hear from engineer Colin Angle, cofounder of iRobot, the company that makes the Roomba vacuum cleaner. In this podcast, he explains how small inventions can yield huge results. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

New DNA evidence shows that dogs were probably domesticated from wolves in the Middle East about eight thousand years ago. But wolves are generally fierce animals that travel in packs, and they're usually afraid of humans. That's pretty far off from the behavior of today's family pets. So how could that poodle in your backyard have come from a wolf? To find out, we spoke to Clive Wynne, who studies animal behavior at the University of Florida. Podcast produced by David Levin. Original interview by Gaia Remerowski. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn more about undersea archeology, go to pbs.org/nova

NOVA Minutes are a regular radio features that air three times per week on 89.7 WGBH-FM in Boston. In this episode, experimental psychologist Laurie Santos explains how she studies monkeys in order to learn how humans think. Produced by David Levin and Rob Chapman. Original interview by Josh Seftel and Tom Miller. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Exclusive funding for "The Secret Life of Scientists & Engineers" provided by the Alfred P. Sloan Foundation. Learn more at pbs.org/nova/secretlife

In this podcast, radio producer Nick Van der Kolk describes how he ran into Al Gore on an elevator in Chicago. Do you have an elevator story of your own? Have you ever been stuck in one? Did you overcome an elevator phobia? Tell us about your experience at pbs.org/nova/tech . Podcast produced by David Levin. Interview by Lawrence Lanahan and Bruce Wallace. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers.

In this podcast, Paul Goldberger, an architecture critic for The New Yorker, describes how the elevator changed the face of New York City. Produced by David Levin. Interview by Joe Seaman. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Hear the story of one New Yorker who was stuck in an elevator for almost two days. Find it at pbs.org/nova/tech