I have teeth but i don't bite. Who Am I ?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Which point will the car reach to go out?

Do you know who was buried in John's tomb?

Can you find the thief by just looking at the picture below?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

Can you name an animal whose killing cannot be performed without spilling your own blood?

If two's company, and three's a crowd, then whats four and five ?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?