### The Perfect Counterfeit Bills

A man can make perfect counterfeit bills. They look exactly like real ones, they’re made of exactly the same materials, made the same way, everything. So perfect, one could pretty much call them real bills.

One day he successfully makes a perfect copy of another bill.

However, he gets caught when he tries to use the copy. How is this possible?

A man can make perfect counterfeit bills. They look exactly like real ones, they’re made of exactly the same materials, made the same way, everything. So perfect, one could pretty much call them real bills. One day he successfully makes a perfect copy of another bill. However, he gets caught when he tries to use…

### 4 Gallons of Water

You have two buckets, one holds exactly 5 gallons and the other 3 gallons.

How can you measure 4 gallons of water into the 5 gallon bucket?

(Assuming you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

You have two buckets, one holds exactly 5 gallons and the other 3 gallons.

How can you measure 4 gallons of water into the 5 gallon bucket?

(Assuming you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)