You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

What is the difference between a jeweller and a jailer?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

A sundial has the fewest moving parts of any timepiece. Which has the most?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Solve the following series:
AZ, GT, MN, __, YB

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H