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?

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.

How can a man go eight days without sleep?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

What's a single-digit number with no value?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Can you Find and name the hidden bird in the picture below ?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?