What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

How is the moon similar to a dollar?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What jumps when it walks and sits when it stands?

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

What is the Surname of Barbie Doll?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?