What country can make you shiver?

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 solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I know a nine-letter word having only one vowel.
Do you ?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

81 x 9 = 801. What must you do to make the this equation true?

Find the last number in the series below:

voN luJ yaM raM ---