What is harder to catch the faster you run?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What seven-letter word has hundreds of letters in it?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Replace the question mark in the picture below.

Can you name four days which start with the letter 'T'?

Spot 5 differences in two Christmas tree below:

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What country can make you shiver?