Watt next?
At present a few
microwatts can be
harvested from the air,
but it takes tens of
thousands just to
make a call.Prodigal sun
Ambient light can also
be turned into a trickle of
electricity using solar
panels... but those panels
are currently only
17% efficient.A bug’s life
Backscatter is an
accidental reinvention
of Soviet spy technology
where bugs were
activated and powered
by radio waves.
FUTURE GADGETS