Weekly Contest-1

Every week, there will be a contest, having to do with a certain topic! If you get the riddle(or riddles) correct, you with receive a gift!
THIS WEEKS TOPIC-Science/Health

What am I?
I start out blue, then as I run I become red, what am I?

You could be left handed, or even right! But you use both sides of me! What am I?

I am the most used physical part in your body, what am I?
 
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