your email messages from prying eyes usually
means looking up the recipients' public encryption
keys. A crypto scheme gets rid of this step
by using email addresses to automatically
make the keys.
recognition to sort Holocaust tapes
Thousands of hours of video of Holocaust survivors
recounting their experiences is invaluable for historians
and educators, but annotating the collection by
hand to make it searchable is a daunting task. An
ambitious project aims to use speech recognition
technology to automate the annotation process.
sensor spots single photons
Making sensors that can detect the smallest amount
of light possible is tremendously difficult but
not impossible. The key to making them useful is
making them fast.
lasers pulse shorter
Merging two laser pulses actually makes a shorter
pulse than either of the originals, if the two are
different colors. The trick is perfectly synchronizing
pulses that are far shorter than the blink of an
eye. The payoff is faster data communications.
clean wire machine
One way to build wires only a few hundred atoms
wide is to fill electrified microscopic molds with
metal vapor. Reversing the current turns out to
be a good way to keep the molds from clogging, which
makes for longer wires.