The commander-in-chief was accused of disrespecting the US Marine Corps Tuesday when he gave an awkward salute to a pair of Marines in Manhattan while still holding his coffee cup in his hand.

But it's unfortunately easy to spill while walking from place to place mug in hand. And according to a new study, this happens because we’ve been holding our coffee mugs the wrong way.

Your remaining three fingers — middle, index and pinkie — are tucked into the palm of your hand.” Courtesy of Myka Meier This is how you’re supposed to hold your coffee cup. The proper way ...