Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Why Aeroplane windows are round?

Prove that the below maths equation is true.

8 + 8 = 91

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

I know a nine-letter word having only one vowel.
Do you ?

What is the word or phrase?

Can you make four (4) nines (9) equal 100?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?