Pogo stick!

This is new!

Self-Balancing Robotic Pogo Stick - YouTube!

Wow! Amazing!!! :o

very cool

College: Pumping out cool (but completely useless) projects since ~1640AD.

that’s crazy!!! :o hehehe

@ sıɹɥɔ : Often thoses useless projects led to something more useful! But I agree that I’ve seen some pretty damn useless invention, just look at the Ig Nobel award!