You have been abducted by aliens. For arcane reasons, you have been chosen for a very special decision. Half of everything on the planet will disappear. The other half will remain unscathed. It is up to you to decide how everything will be divided, and once you have chosen, which half goes and which half stays. What is your criterion for the devision of halves? Which half stays? P.S. Choosing not to choose will end in a default decision by the aliens to eliminate the entire planet. Everything.