John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Can you find the hidden animal in the picture below?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

I have eight fingers and two thumbs but I do not live. What Am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

How can you make a TV, a bed, a dog, and a car liquid?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?