Cristina was born in 1888. She just had her 30th birthday today how did that happen?

How can you tell a raw egg from a hard-boiled egg?

Which is faster, Heat or Cold ? Explain.

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What English word has three consecutive double letters?

What Deficiency does the below rebus represent?

VIT_MIN

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

What question can you never answer yes to?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Find the value of "?" in the ball picture Riddle below: