I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

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

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

A monk has a very specific ritual for climbing up the steps to the temple. First, he climbs up to the middle step and meditates for 1 minute. Then he climbs up 8 steps and faces east until he hears a bird singing. Then he walks down 12 steps and picks up a pebble. He takes one step up and tosses the pebble over his left shoulder. Now, he walks up the remaining steps three at a time which only takes him 9 paces. How many steps are there?

Which is the smallest number that you can write using all the vowels exactly once?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

Can you find out the remainder when 3^300 is divided by 5?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

What does below chemistry rebus means?