What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

I have branches, but no fruit, trunk or leaves. What am I?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

What has a ring but no finger?

Which Travels Faster? Solve below famous picture riddle:

What question can you never answer yes to?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

I have a head like a cat and feet like a cat, but I am not a cat. What am I?