Name a key which is hardest to turn.

Why do we preferably have round manhole covers and not square ones?

What does this rebus riddle means ?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?