Just imagine what you could do with a third arm.

You could sip coffee and type an email. You could scratch your nose and play Call of Duty. You could solve the Rubik’s cube and conduct a symphony. You could play Ping-Pong and knit a sweater. Clearly, we could all use a third arm.

Fortunately, giving us a hand with a third arm might be a promise science can deliver on, like, soon. That’s because engineers at the Advanced Telecommunications Research Institute in Japan recently showed off