What is so fragile that saying its name breaks it?

Spot 5 differences in two Christmas tree below:

I have an eye but still cannot see.

Who am I?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

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

What does this rebus mean?

O
N
C
E
TIME

Aaron, Brad, Christopher, Danny and Elvis decided to play a game of tiddlywinks. In this game they decided that one win will get 1 point for winning, 0 for losing and 1/2 in case of a tie.

They finished the game in alphabetical order and it was found that the scores were different for each person.

Based on the following two statements, can you find out the result of the individual games?
Brad: No one could finish like me, without a loss.
Elvis: No one played worse than me, I finished without a single win.

If eleven plus two equals one, what does nine plus five equal?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.