Tribbles do three things: look cute, sound cute, and multiply. When one of my friends made a tribble—clearly a fake as it didn't sound cute or multiply—I decided that I should take a stab at it. Not literally, of course. Have you seen how cute they are? (You could just skip to step 7 and make a fake tribble, too.)
Making sound is easy. That's what Arduinos are for. Cute sound might be a bit more difficult, but it's manageable. Multiplying, though, was going to be an issue … until I remembered that the Arduino programming language can do the four basic mathematic functions including multiplication in a shockingly short period of time. Like tribbles!
And so was conceived (brace yourself for the puns) the tribble calculator. All it can do is look cute, sound cute, and multiply.
(If you just want a stuffed tribble without all the bionic implants, skip to step 7.)
(If you wanted to see the video, it's on step 8.)