* When you go to smack your brother for stealing your last juice box, you actually move a little bit of air out of the way in front of your hand as it travels through the air.
* This tiny amount of air hits your brother before your hand does but it doesn’t do much to him.
* When you go to hit a fly, however, that small amount of air is enough to push the fly away.
* Since the air also have lots of directions it can travel, it push the fly with much less force than your hand would.
* So the fly doesn’t experience nearly as much force as your brother’s face does.
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