文档介绍：Surprisingly Modern Neandertals • National Medal of Technology
QUARK SOUP
CERN cooks up a
new state
of matter
see page 16
APRIL 2000 $
QUANTUM
Teleportation
The Future of Travel?
Or puting?
Of Mice and Mensa
ic formula
for a smarter mouse
Brown Dwarfs
Stars that fizzled
fill the galaxy
Copyright 2000 Scientific American, Inc.
Contents
April 2000 Volume 282 Number 4
COVER STORY
50
Quantum Teleportation
Anton Zeilinger
The “spooky action at a distance” of quantum
mechanics makes possible the science-fiction dream of
teleportation—a way to make objects disappear from one
place and reappear at another. It has already been
demonstrated with photons. Yet the greatest application
of teleportation may be puting.
SPACE CHANNEL/PHILIP SAUNDERS SPACE
62
Building a Brainier Mouse
Joe Z. Tsien
To ically engineer a smarter mouse, scientists
assembled some of the ponents of learning and memory.
Understanding Clinical Trials 69 Monitoring Earth’s Vital Signs 92
Justin A. Zivin Michael D. King and David D. Herring
The journey from initial A new NASA satel-
medical research to the lite—one of a fleet
bottle in your family’s called the Earth Ob-
medicine is serving System—
complex, time-consuming uses five state-of-
and expensive. Can the the-art sensors to
clinical trial process better diagnose the
be refined? ’s health
from the sky.
The Discovery of Brown Dwarfs 76
Gibor Basri
Less massive than stars but more massive TRENDS IN PALEOANTHROPOLOGY 98
than s, brown dwarfs were long as-
sumed to be rare. New sky surveys, howev- Who Were the Neandertals?
er, show that in our galaxy the objects may Kate Wong, staff writer
be mon80 as stars. Controversies rage over
how much they were
like us behaviorally
The Aleutian Kayak 84 and biologically.
e B. Dyson With contributions by
The Aleuts built these small boats for hunters on the open Erik Trinkaus, Cidália
ocean. The sophisticated design is s