What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

Can you divide the below-given shape into four equal and identical pieces?

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

How many Watermelons are there in the below picture?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

You need to remove two matchsticks to make the below equation true. Can you do it ?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?