How many words can a pen with half refill write?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

I am lying and I always lie. Tell me whether I am lying or telling the truth.

In the image given, you can find several triangles. Can you count them all?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?