Next time you visit the hardware store, you can probably get most of the materials you'll need to build a robotic hand.
Especially if you follow instructions from Aaron Thomen.
For a little less than $200, Thomen built a Terminator-like robotic hand. And it's not just a cool-looking contraption. It’s powered by servomotors -- which are extremely precise motors -- and an Arduino controller. The combination results in a mechanical hand that has the finesse to use a pair of scissors and the strength to lift a jug of water.
Thomen didn’t just design and build a robotic hand — "anyone" can do that. He created a set of video instructions to go with an instructables post so virtually anyone can replicate the process.
The videos are each around five-minutes long, and while there aren't any stated prerequisites for the project, you'll likely need some dexterity, coding knowledge, patience and time.
Let us know if you try it, it's the stuff sci-fi movies are made of.