Can you solve these Brain Strains? 
A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What has many keys but can’t open a single lock?

It belongs to you, but other people use it more than you do. What is it?
I have branches, but no fruit, trunk or leaves. What am I?
What gets wet while drying?

What is always in front of you but can’t be seen?