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In this undated photo provided by Prifysgol Aberystwyth University, researchers David Whitworth, left, and Sara Mela, pose for photo in the lab at Prifysgol Aberystwyth University in Aberystwyth, Wales. According to results published online Monday, July 28, 2014, in the American Journal of Infection Control, the 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)
Photo by: Anthony Pugh
In this undated photo provided by Prifysgol Aberystwyth University, researchers David Whitworth, left, and Sara Mela, pose for photo in the lab at Prifysgol Aberystwyth University in Aberystwyth, Wales. According to results published online Monday, July 28, 2014, in the American Journal of Infection Control, the 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)

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