This one will be environmental. Suppose you have a reusable bag (yes, one of those from the conferences). Then inside your bag you can put a lot of things, like apples, cucumbers, potatoes… or other reusable bags with other things inside. Okay, now let’s assume that your fabric bag is so big that you can fit any reusable bag with anything inside, including other bags (all of them made of fabric, of course), and so on. Now the question is: is it possible to have a fabric bag that contains all the existent reusable bags?
This question (well, without all of the environmental setting) is known as Russell’s Paradox. Bertrand Russell, born in May of 1872, was a British mathematician, philosopher and writer, who received the Nobel prize of literature in 1950.