We all feel the biological master clock, ticking deep within our brains, that tells us when to sleep and when to wake.
Well, it turns out that our skin cells have a circadian rhythm of their own. Researchers have found that depending on the time of day, our skin's stem cells busy themselves with different types of tasks.
I'm Michel Martin and this is TELL ME MORE from NPR News. We've talked before on this program about why Latinos in the U.S. are more likely to tweet and use other social media than other Americans. Today, we're going to hear from a Latino tech leader who wants to boost the Latino presence in the science and business of technology. We'll talk about that in just a few minutes.
A fishmonger tosses a just-purchased fresh salmon to a colleague behind the counter at the Pike Place Fish Market in Seattle.
Credit Emilio Morenatti / AP
An Almadraba tuna is lifted by a crane in the port of Barbate, Cadiz province, southern Spain. Almadraba tuna is caught by an elaborate and ancient Andalusian fishing method used in Spanish coastal areas close to the Strait of Gibraltar since Phoenician times.
Credit Joe Raedle / Getty Images
A halibut is seen on the line of a fisherman in Ilulissat, Greenland.
Credit Eric Risberg / AP
A fisherman checks the measurements of a Dungeness crab he just pulled in from the Pacific Ocean off Marin County, Calif.
Credit PA Photos/Landov
A swordfish chills on ice.
Credit Christopher Furlong / Getty Images
A fisherman holds freshly caught potted brown shrimp in Southport, England.
The Nobel Prize in Chemistry was awarded jointly to Martin Karplus, Michael Levitt and Arieh Warshel Wednesday. Karplus, Levitt and Warshel won the prize for laying the foundation for computer models that help researchers understand and predict chemical processes like the purification of exhaust fumes or photosynthesis in green leaves.