... study)
(NASA)
The Future of Space Exploration 19Key Space Explorations of the Next Decade
Copyright 1999 Scientific American, Inc.
Spaceflight Today20 Scientific American Presents
The
International
Space ... Xue
Institute of Scientific and
Technical Information of China
P.O. Box 2104
Chongqing, Sichuan
PEOPLE’S REPUBLIC OF CHINA
tel: +8 6-2 3 6-3 8631...
... the collision of two
three-branes.
Thus, branes are no longer the ugly
ducklings of string theory. They have tak-
en center stage as the microscopic con-
stituents of M-theory, as the higher-di-
mensional ... any
trouble recognizing the truth of the fun-
damental unified theory. The test will be
whether the theory successfully accounts
for the measured values of th...
... after the insult.
As the subject was walking down the
narrow hallway, a six-foot, three-inch,
250-pound accomplice of the experi-
menter walked toward him down the
middle of the corridor. Southerners
who ... MANAGER
41 5-4 0 3-9 030 fax 41 5-4 0 3-9 033
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DALLAS
THE GRIFFITH GROUP
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CANADA...
... make true “off -the- shelf” organs a reality.
12 SCIENTIFIC AMERICAN PRESENTS
Copyright 1999 Scientific American, Inc.
YOUR NEW BODY
YOUR BIONIC FUTURE 13
tains a space for the formation of the tissue ... of the tale will include the transplantation of the human
brain with all its complexity preserved. But the brain can’t func-
tion properly without the plumbi...
... Once the
STM probe comes close enough to one
of the surface atoms—around a nano-
meter (one billionth of a meter) away—
the electron cloud of the atom on the end
of the probe and that of the surface ... atoms in a circle on top of a copper sur-
face. The ripples inside the ring are the result of
the wavelike behavior of electrons in the system.
24
Copyr...
... would
be the derivation of the three-dimensional representation of the
world from the two-dimensional signals falling onto the retinas
of our two eyes or even onto one of them.
Visual theorists ... contours. Another
and perhaps more striking case is the fill-
ing in of the blind spot. The blind spot in
each eye is caused by the lack of photore-
ceptors in the ar...
... including the pres-
ence or absence of nearby radiation-emitting stars.
On the other hand, astronomer David F. Gray of the Univer-
sity of Western Ontario in Canada has challenged the existence
of the ... geologic features of plan-
ets around other stars would require an array of space tele-
scopes the size of the U.S. But pictures of Earth do not reveal
the...
... from the weather service’s.
“More cloudiness, high of 74,” says
Abrams in a voice-mail message. “It will
be 60 to 70 percent cloudy. A one- or
two-out -of -1 0 chance for showers. A one-
out -of -1 00 ... ground-based gauges and other
TOP -OF -THE- LINE EQUIPMENT: The Doppler radar tower (above) near Washington Dulles Air-
port is one of the workhorses intended to increase the...
... nitrogen narcosis
in the dark underneath the
stern of the wreck of the fa-
mous Japanese battleship Naga-
to. The 216-meter-long flag-
ship of the Imperial Navy dur-
ing World War II rests upside
down ... on
the islands, up to 90 percent of their radi-
ation exposure would come from the ce-
sium in the local produce. Almost all the
rest of their dosage would come...
... promised future bene-
fits once the huge baby-boomer genera-
tion retires. The basic cause of the
shortfall resides in the awesome, glacial
pressures of demographics. The pay-as-
you-go concept ... called the U.S. Bur-
den of Disease and Injury, by the Harvard School of Pub-
lic Health, found a staggering 40-year gap between the
longest-lived Americans
—Asian -America...