Yell, Scream and Curse at Your Phone to Charge It  Korean
boffins have created a new type of cellphone battery that
responds to the human voice, meaning you get rewarded with juice
the more you talk into it. The so-called "sound power" works
when the tiny strands of the zinc oxide pressed between two
electrodes react to soundwaves, which generate electrical
currents and charge the battery.  Leading the project is Dr
Sang-Woo Kim at the Sungkyunkwan University in Seoul, South
Korea, who hinted at future projects: "Sound power can be used
for various novel applications including cellular phones that
can be charged during conversations and sound-insulating walls
near highways that generate electricity from the sound of
passing vehicles." [IT Times via The Telegraph]