Can you name an animal whose killing cannot be performed without spilling your own blood?

Why is 6 afraid of 7?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What has a bottom at the top?

What number when divided in half becomes zero?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Can you make a six-letter word using the letters N, A and B ?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Who always enjoys poor health?

What's the only room from which no one can enter or leave