Sigi Kolbe/Getty Images
What has been the most successful animal ever?
Derek Johnson,
Moreton-in-Marsh, Gloucestershire, UK
Shutterstock/Pixinoo
My water aerobics instructor says to press my fingers together to increase resistance. The total surface area is the same with fingers open or closed, so why does it make a difference?
Mary Jo McMullen,
Tuscon, Arizona, US
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