(I am borrowing a page from Cotton and doing some Cross-Dimensional Thread Necromancy. This was originally posted about four years ago, with some changes.)
The Science Fiction Genie appears to you and offers you one (1) of the following sf plot devices to keep. Along with a working prototype, you also get complete blueprints and a crackerjack team of lawyers to assure that your patent application (if you make one) gets by without any problems, thefts, or sneaky corporate subversions.
All models are relatively cheap to build and can be mass-produced with modern industrial processes. So, which one of these would you pick to gift/sell/impose upon the world?
(Or keep for yourself, I guess. In some of these cases that would definitely be a good idea.)
1) The Time Machine. The classic H.G. Wells model; forward and back as far as you want. Make sure you pull the right lever!
2) FTL Drive. Up to 55 lightyears per hour.
3) Food Replicators. They process almost anything (including dirt) and make it into nutritious soup. They're solar-powered and cheap enough for the world's aid agencies to supply the entire third world pretty easily.
4) Artificial Intelligence. This sentient software is actually a lot smarter than we are. It seems to like us, though. So far. (You can get it in Windows or Mac!)
5) Supernova Bomb. It blows up the sun. Yes, we all die.
6) Teleporter. As in The Fly, entry and exit portals are required. Check for insects in pod before using!
7) Cybernetic Brain Implants. You can browse the internet in your head, and make your thinking clearer, faster, and more precise. You can also adjust your mood with slider bars, though this may get complicated.
8) Shrink Ray. It makes things smaller; as small as you want, though shrinking slows down as things become microscopic. Another setting restores objects and people to their original size. Aside from the Restoration Ray, the shrink effect is permanent.
9) Personality Upload Scanner. It reads and records your entire brain, and then translates that into a realistic computer simulation of your personality. Your virtual self will know everything you do, and will sincerely believe that it's you. (In a sense, after all, it is.) You don't necessarily want it running at the same time as you; but if you die, it's a radical kind of life insurance.
10) Dimensional Transporter. Just like in Sliders, but with much better navigation control. The user-friendly interface allows you to select specific historical events as branching points (i.e., "A world where the South won the Civil War") or general conditions ("A world where there is no racism.") No guarantees about your reception there!
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We may make the world better or worse, but at least we're going to make it stranger!