Dear Science: I'm gearing up for a summer vacation, and I've been burned before — so I want to make the most of all these half bottles of sunscreen left in my cabinet. If you mix equal amounts of SPF 10 sunscreen and SPF 30 sunscreen, do you get SPF 10, 20, 30 or 40? And what SPF should I be aiming for?
Here's what science has to say:
Step away from the mixing bowl, friend. Read More...
Our readers share tales of their ramblings around the world.
Who: Cecily Nabors (author) of Silver Spring, Md., and her friend Julie Small of Olney, Md.
Where, when, why: In mid-November, Julie and I flew to Panama for a week-long trip led by the Audubon Naturalist Society (ANS), with a local leader, Carlos Bethancourt. We've taken many naturalist trips with ANS, but this one provided an exceptional combination of nature observation, history and current events. Read More...
Beccaria expresses not only the need for the criminal justice system, but also the government’s right to have laws and punishments. He believe in the social contract, or the idea that freewill and rational individuals made a choice to live in a society instead of living alone.Click to see full answer. Keeping this in consideration, what was Beccaria’s theory?Beccaria believed that people have a rational manner and apply it toward making choices that will help them achieve their own personal gratification. Read More...