A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What is both possible and impossible at the same time?

When is the top of a mountain similar to a savings account?

What is the next number in this series?

4,12,84,3612....

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

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

Which tank will fill first?

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