These have nothing to do with each other except that I stumbled across them yesterday. And they're cool.
The Antikythera mechanism - link here (http://io9.com/5441889/advanced-imaging-reveals-a-computer-1500-years-ahead-of-its-time)
"Using nothing but an ingenious system of gears, the mechanism could be used to predict the month, day and hour of an eclipse, and even accounted for leap years. It could also predict the positions of the sun and moon against the zodiac, and has a gear train that turns a black and white stone to show the moon's phase on a given date. It is possible that it could also show the astronomical positions of the planets known to the ancients: Mercury, Venus, Mars, Jupiter and Saturn."
Airnergy WiFi power system - link here (http://www.engadget.com/2010/01/09/airnergy-wifi-power-system-gives-rca-a-reason-to-exist-video/)
"...Airnergy power system, which harvests energy from WiFi signals ... the pocketable dongle picks up WiFi signals from the air and manages to charge an internal battery through some magic inside. You don't have to connect to a network, you just have to be in a place that has signal, and it will automatically charge up."