What is the centre of gravity?

What kind of tree can you carry in your hand?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

Can you name four days which start with the letter 'T'?

Why do you find that most of the buildings are deprived of the 13th floor?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

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

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?