What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

I make two people out of one. What am I?

You can see it everyday, But cannot touch it at will. What is it?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What does the rebus below mean?

TEN BADTION

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What's a single-digit number with no value?