fires one photon at a time
secure communications exists -- in the lab.
In order to make it in the real world, the
technology has to be packaged in practical
devices. A special light emitting diode goes
a long way toward that goal.
turn more heat to power
Turning heat into electricity is old hat, but the
techniques to date haven't been efficient enough
to generate a lot of power. A method for making
semiconductor devices changes the equation.
protected on unlocked Web sites
The only way to be sure you are getting authentic
data on the Web is to download large chunks of data
that have been stamped with a digital seal of authenticity.
A new scheme lets you download just a portion of
a secure document.
gain ultrasonic vision
Surgeons have been using ultrasound for years to
view their patients' insides. A hand-held device
gives surgeons the equivalent of x-ray vision by
superimposing the ultrasound image on the patient's
changes laser color
Mix liquid crystals with powdered white glass and
you get a light source that changes color according
to the temperature.