Answer:
I make everyone blind. You can't see me but I will always come back for you. What am I?
I keep things green and keep kids happy during summer time.
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
You use me between your head and your toes the more I work the thinner I grow.
What invention lets you look right through a wall?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?