Which is faster, Heat or Cold ? Explain.

Can you count the number of squares in the figure below?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

If 21x = 79x, what is the value of x?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

What is always in front of you but can’t be seen?

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

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?