scientific american - 2004 05 - the time before time
scientific american - 2004 05 - the time before time
... disrupting the signals between neurons.
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28 SCIENTIFIC AMERICAN MAY 2004
I
n the 18 years since they were dis-
covered, high-temperature supercon-
ductors ... what
remains of the mess left by the
Exxon Valdez. The oil compo-
nents are poisoning the otters.
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www.sciam.com SCIENTIFIC...
scientific american - 1996 05 - the comets' lair
... Among the most com-
mon mines in this group are the Italian
scatterable mines TS-50 and SB-33 and
the hand-laid VS-50 and VAR-40, the
U.S made M14, and the Chinese Type
72. Typically, these weapons ... Space Adminis-
tration unveiled the X-36 the first high-performance jet with
no tail at all. Remotely controlled and powered by a cruise-mis-
sile engine, the 5.4-meter-long, 600-...
scientific american - 1997 05 - the 100 - year weather forecast
... from the bubble-enclosed flow-
er. The filters in the kit allow for sepa-
rate samples to be taken at different
times throughout the day. For example,
the peak scent for the orchid purchased
from the ... offered to them, some
home owners will balk at the idea of
selling their excess electricity at a dis-
count to the local utility, which then re-
sells the power for several...
scientific american - 2004 02 - the future looks flexible
... that the mi-
grating bats may not be using
their echolocation when the
collisions occur. Others spec-
ulate that the wind turbines
may be emitting high-pitched
sounds that draw the bats to
the ... two other groups the car-
charodontosaurs and the spinosaurs—man-
aged to evolve similarly supersize propor-
tions.) In recent years, a few prime-mover hy-
potheses have emerged, attrib...
scientific american - 1995 05 - what found the top quark
... than the 1 4-
out-of-15 match. To the scientistsÕ de-
light, there was a large difference, al-
though commercial implications inhibit
candor when they are posed the ques-
tion, ÒHow big is the ... small and medi-
um-size businesses.
Until the early 1990s, the World Bank
ignored the economic signiÞcance of
these events or dismissed them as irrel-
evant. At the same time, ho...
scientific american - 2001 05 - get the idea (tomorrow's web will)
... Biológica of Doñana-CSIC. At night,
the animals leave the safety of the scrubs to
hunt on the open lands and find themselves at
the mercy of hounds unleashed by the poach-
ers during their nocturnal ... badgers
belonged to the five territories in Coto del
Rey; the others resided within the core of the
park, Reserve Biológica. Of the tagged bad-
gers, the team recorded 13...
scientific american - 2004 04 - has science missed half the brain
... subjects at the
time of the serendipitous observation. Of the
30 individuals who received the EP-MRSI
scans, 23 reported immediate mood im-
provement, the team says in the January issue
of the American ... the turn of the 20th century.” The stone “contains more
lithium than any other stone on the planet” and “emits a signa-
ture one-of-a-kind healing energy.” How doe...
scientific american - 2004 07 - will gene doping change the nature of sport
... PAP
6 T cells then attack PAP-
containing cancer cell
40 SCIENTIFIC AMERICAN JULY 2004
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quires isolating the patient’s white blood cells and then
separating ... Bayesian theorem:
P
before
× D
P
after
=
P
before
× D + 100% – P
before
The probability of God’s existence after the evidence is con-
sidered is a function of the pro...
scientific american - 1993 01 - the turbulent birth of the milky way
... CELSIUS)
4,9 005, 150 4,650 4,400
12-BILLION-YEAR-
OLD AGE TRACK
15-BILLION-YEAR-
OLD AGE TRACK
NGC 288
NGC 362
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means that within the halo the only re-
maining main-sequence ...
declines as the reefs get farther away
from two centersÑone in the Indo-Pa-
ciÞc and the other in the Caribbean.
The outlines of a map marking plum-
meting di...
scientific american - 1993 05 - building soft machines from smart gels
... betatron
have the special advantage of produc-
ing their greatest eÝect about 1
1
Ú 2 inch-
es below the surface of the body. With
X-ray therapy as used up to the present
time, the eÝect is greatest on the ... the sur-
face, and decreases with depth. Direct
use of the high-speed electrons from
the betatron may be even more valu-
able than the use of the X-rays. Most of...