What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Why is a river so rich ?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

I add 5 to 9 and get 2. The answer is correct, so what am I?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What's the only room from which no one can enter or leave

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Solve below rebus puzzle?

In which direction should the missing arrow point?