You have two empty jugs and a tap of running water. One jug can hold exactly 3 litres of water while the other can hold exactly 5.

Using no other equipment, how do you get exactly 4 litres of water?

I heard this puzzle when I was a boy so it has been around for a long time.

The next puzzle however is of more recent vintage – I encountered it only in the heady days of the internet. It’s in the same genre as the water jugs puzzle but a little harder!

You have two ropes and a cigarette lighter. Each rope, when lit at one end, takes exactly one hour to burn to the other end, where the burning need not necessarily proceed at a uniform rate.

Using no other equipment, how do you measure exactly 45 minutes of time?

Achilles & the tortoise

The surprise exam

Newcomb’s problem

Newcomb’s problem (sassy version)

Seeing and being

Logic test!

Philosophers say the strangest things

Favourite puzzles

Books on consciousness

Philosophy videos

Phinteresting

Philosopher biographies

Philosopher birthdays

Draft

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