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

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What goes up but never comes down?

Which part of London exists in France as well ?

Can you spot the hidden girl in the picture below?

A sundial has the fewest moving parts of any timepiece. Which has the most?

our enemy challenges you to play Russian Roulette with a 6-cylinder pistol (meaning it has room for 6 bullets). He puts 2 bullets into the gun in consecutive slots, and leaves the next four slots blank. He spins the barrel and hands you the gun. You point the gun at yourself and pull the trigger. It doesn't go off. Your enemy tells you that you need to pull the trigger one more time, and that you can choose to either spin the barrel at random, or not, before pulling the trigger again. Spinning the barrel will position the barrel in a random position.

Assuming you'd like to live, should you spin the barrel or not before pulling the trigger again?