What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

The more it dries, the wetter it becomes. Can you tell what it is?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

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

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Find the number of squares in the below-given picture.

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Can you find the key in the picture below?