Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
What has two legs but cannot walk?
What do you get if you milk a cow after an earthquake?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Which bow can't be tied?
What has wheels and flies but is not an aircraft?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?