Why Aeroplane windows are round?

Which digit occurred maximum times between the number 1 and 1000?

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

Find the next number in the series.
1 10 24 43 67 ?

How many triangles are there in the picture below?

What goes through cities and fields, but never moves?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What is the last thing you take off before bed?

10+10 and 11+11 can give you the same answer.

Explain how?