Assume Can Opened
A mathematician, a physicist, and an engineer are in a shipwreck. They wash up on a desert island, and an entire case of canned food washes up with them. But they don't have a can opener!
The engineer says, "We can gather some flexible branches from palm trees, and get a sharp rock, and attach it to a stick with the palm fronds, and then we can use it like an axe to cut open the cans."
The physicist says, "We can make a fire with loose driftwood, and then put the cans in the fire, and the heat will cause the cans to explode, and then we can eat the food. And it'll be hot, as a bonus!"
The mathematician says, "Assume we have a can opener."
