We changed the title from "First steps to converting 2.4GHz WiFi into usable energy to power small devices", which is not a good rewrite because it's impossible to quickly determine whether it's accurate, and because it doesn't use representative language from the article itself.

I've taken a crack at shortening the article's own title to fit HN's 80 char limit. Since I have zero idea what a "spin-torque oscillator" is, I probably got this wrong. If anyone can suggest a more accurate and neutral title, we can change it again.