What is both possible and impossible at the same time?

what does the below rebus mean?

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?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

I have feet, but no legs. Which animal Am I?

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?