What is so fragile that saying its name breaks it?

What does this rebus riddle means ?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Find the hidden panda in the image below.

What always comes into a house through the keyhole?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?