If you've ever tried licking the terminals of a 9 volt battery, it is likely you found a tingling sensation and a bitter metallic taste. It turns out researchers have looked at electrical taste stimulation. After viewing this video I looked at a few papers, but didn't see anything like Hiromi Nakamura's fork. I couldn't find any papers by her on this, but if it works as shown it might be very useful for playing with food and even making it possible to cut salt intake. In any event I suspect a lot of people are trying this now.
Atomic watches have been built, but they're not accurate enough to measure the effects of special and general relatively on Earth in human travel (altitude change for general relatively). About ten years ago someone took matters into their hands and put together a wrist watch with enough accuracy.