What word does this rebus represent?

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What number comes next in the series?

5 15 5 18 5 24 14 20 _

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What is the word or phrase?

What time is it when an elephant sits on a fence?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

How is a fly different from a mosquito?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What can you see in the middle of March and April that you can never see in any other month?