What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

what does this below rebus represent identXQQQQQME

Can you place six X (crosses) in below board without making three in a row in any way ?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

Why do we preferably have round manhole covers and not square ones?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

How could a baby fall out of a twenty-story building onto the ground and live?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?