How can you make number one disappear by adding something to it?

Find the hidden panda in the image below.

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

What has many teeth, but cannot bite?

A man dies of old age on his 25 birthday. How is this possible?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What four weights can be used to balance from 1 to 30 pounds?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?