How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What is the word or phrase?

Who is that with a neck and no head, two arms and no hands? What is it?

I have branches, but no fruit, trunk or leaves. What am I?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

Solve the equation in the image by looking at the pattern closely.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?