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

What does this mathematical rebus means ?

Can it be possible to build a house that has all its four walls facing towards the South?

By using 'because' continuously three times, can you make an English statement ?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

I am sure no one can have two things for dinner. what are they?

I have teeth but i don't bite. Who Am I ?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?