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Artificial
DNA can solve mathematical problems, but so
far electronics is better suited to that task.
A different kind of DNA computer handles a
problem computer chips can't touch -- fighting
cancer. The DNA automaton senses cancer cells
and releases a strand of DNA that kills cancer
cells -- at least in test tubes.
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Memory
stores three bits in one
A method for making memory from tiny wires promises
to cram more than 10 DVD's-worth of data into a
square centimeter by using small memory cells that
hold three bits rather than one each. The memory
cell is a nanowire transistor with a twist -- it
is coated with an organic compound that undergoes
a chemical reaction whenever voltage is applied.
The reaction gives the transistor eight levels rather
than the usual on and off.
Chaos
seems to aid learning
At the conscious level, chaos and learning don't
mix very well. But at the neural level things might
be different. A computer simulation shows that chaotic
nerve signals may play a key role in learning motor
skills. It comes down to using chaos to pack more
information in each pulse. The method could boost
robotics and communications technologies.
Y
switches set up low-power logic
It's getting harder to make blazingly fast computers
that aren't also blazingly hot. One possible solution
is replacing today's logic circuits with designs
that do the math without throwing away bits, a major
cause of heat in computers. A plan for implementing
this reversible logic using tiny Y-shaped switches
promises ultra low-power computers.
Briefs
Color
display blocks prying eyes... Net
lets hand-helds view 3D data... Speed
limits could slow viruses... Nano
test tubes fabricated... Nanowires
make tiny compasses... Upbeat
computers boost users.
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