so a while ago i was extolling how great oil is. and i asserted you can run must things on electricity that currently run on oil. except airplanes. heh. at the time it was inconceivable to fly on battery power alone. well. harumph. i'd like to revisit that position. apparently batteries have been on a bit of an exponential tear when it comes to power density. here
's a guy flying a frikken battery powered helicopter. granted it wasn't a very long flight. but man. science fiction, science fact. want.