Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Can you spot the man between the coffee bean in the picture below ?

You bought me for dinner but never eat me. What am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Buy me, smell me or deliver me, I do not change.

Who am I?

You need to arrange three 7 and mathematical symbols to form number 1?