What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Prove that the below maths equation is true.

8 + 8 = 91

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?

What runs around the whole yard without moving?

John was piloting a plane behind a car but was never able to overtake it. Why?

What is the next shape from answers A, B, C, and D figure?

The centre of the third figure is empty. What digit should fit inside?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.