Fun brain teasers which are so hard to finish

I make two people out of one.

What has a head, a tail, is brown, and has no legs?

What is light as a feather, but no one can hold it for long?

How can you make Seven even?

What invention lets you look through a wall?

I am full of holes but I can still hold water. What am I?

I am white when I am dirty, and black when I am clean. What am I?

What has cities but no houses, mountains but no trees, water but no fish?

David's mom has three sons they are-Michael, Harry and __________