If you think sailing at 40 mph sounds challenging, imagine doing it all alone without the use of your arms or legs, or without hearing or with limited vision. Every weekend in San Francisco, a group of sailors with disabilities does just that, taking to the water to push their bodies to the limit.
Cristina Rubke and her father, Chris, are members of the Bay Area Association of Disabled Sailors. On a recent Saturday, they were at San Francisco's Pier 40, where the dock is awash in activity.
There's a hole in the sun's corona. But don't worry â€” that happens from time to time.
"A coronal hole is just a big, dark blotch that we see on the sun in our images," says Dean Pesnell, project scientist for NASA's Solar Dynamics Observatory. "We can only see them from space, because when we look at them [through] a regular telescope, they don't appear."
A brain that trains can stay in the fast lane. That's the message of a study showing that playing a brain training video game for a month can rejuvenate the multitasking abilities of people in their 60s, 70s and 80s.
"After training, they improved their multitasking beyond the level of 20-year-olds," says Adam Gazzaley, one of the study's authors and a brain scientist at the University of California, San Francisco.
Hot summer days often mean air pollution warnings in big cities. But the air inside your kitchen can sometimes be just as harmful. Cooking fumes from your stove are supposed to be captured by a hood over the range â€” but even some expensive models aren't that effective.
Jennifer Logue spends a lot of time thinking about what happens when she cooks. She's a research scientist at Lawrence Berkeley National Lab, where she studies indoor air pollution.