I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I make two people out of one. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Decode this picture on T-Shirt and tell what it says ?

How can you tell a raw egg from a hard-boiled egg?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?