Decode this picture on T-Shirt and tell what it says ?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I am white when I am dirty, and black when I am clean. What am I?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Can you find the key in the picture below?

Which English verb becomes past tense just by rearranging the letters?

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?

How can you take 2 from 5 and leave 4?

Take away the whole and some still remain. What is it?