This undated inverted image shows powder transferred following a handshake, to illustrate the possible transfer of bacteria at Prifysgol Aberystwyth University in Aberystwyth, Wales. According to results published online Monday, July 28, 2014, in the American Journal of Infection Control researchers found that the knocking of knuckles, fist bump, spreads only one-twentieth the amount of bacteria that a handshake does. (AP Photo/Prifysgol Aberystwyth University)

Fist bumps less germy than handshakes

NEW YORK (AP) — When it comes to preventing the spread of germs, maybe the president is on to something with his fondness for fist bumps.

This Jan. 16, 2014, photo shows Keystone High School wrestler Logan Stiner during a match in Sheffield Village, Ohio. The Food and Drug Administration is warning consumers to avoid pure powdered caffeine sold on the Internet after Stiner died after consuming it. Even a teaspoon of the powder could be lethal — it is equivalent to 25 cups of coffee. (AP Photo/Steve Manheim, The Chronicle Telegram)

FDA: Powdered caffeine can be lethal

WASHINGTON (AP) — The Food and Drug Administration is warning consumers to avoid pure powdered caffeine sold on the Internet after the death…