Make a fancier version that can hop. (When this robot was sketched out in the "Inventions of Daedalus" column in Nature a few decades ago, he went into the how-

Make a fancier version that can hop. (When this robot was sketched out in the "Inventions of Daedalus" column in Nature a few decades ago, he went into the how-to-hop issue too, though I don't remember any details.)