Hi gang!  You know how people, especially grown-ups, shake hands when they greet each other?  Well, there is this custom I just read about: medical experts who fly to Africa to stop the spread of deadly diseases.

When they greet each other during a major disease outbreak, they don’t shake hands.  That could spread disease from one person to another.  Instead they bump elbows!  After all, you can’t cough or sneeze onto your elbow!  Try it!

In fact, back in 1918, there was a very bad flu outbreak that killed millions of people around the world.  Well, in Prescott, Arizona, shaking hands was against the law!