Rearrange the letters in "new door" to make one word.

A father's child, a mother's child, yet no one's son.

Who am I?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

What has 13 hearts but no other organs?

What goes up but never comes down?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What seven-letter word has hundreds of letters in it?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???