A man was just doing his job when his suit was torn. Why did he die three minutes later?

What does this rebus mean?

O
N
C
E
TIME

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

A sundial has the fewest moving parts of any timepiece. Which has the most?

What is red and smells like blue paint?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

Which is heavier: a ton of bricks or a ton of feathers?

What is both possible and impossible at the same time?

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?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?