Keeping an active mind has been long considered a key component to a healthy lifestyle, improving memory and overall brain function, and a great way to do that is with brain teasers. Not only are they a fun and challenging mental exercise that'll keep you sharp, they're also the perfect way to take a little break from the stresses of everyday life. And in addition to challenging yourself, you can test your friends and family to see who can reach the answers the quickest! Keep reading for 20 brain teasers that'll seriously stump (and amuse) you, and don't forget to scroll down for the answers.