Perpetual Motion From Negative Mass?

Check out the new Space Time Merch Store! Support Space Time on Patreon Email your answers to: pbsspacetime@ With the subject heading: Negative Mass Challenge Question Challenge question: if 1kg of apples is $5 and 2kg is $10, how much is -1kg of apples? The answer? Priceless. Because you could use negative-mass apples to build warp drives, travel in time, and construct a perpetual motion machine. In fact that last one will be today’