... cousins.
Only we
remain.
Why?
Our
species
had at least
15 cousins.
Only we
remain.
Why?
We
Were
Not
Alone
We
Were
Not
Alone
Copyright 1999 Scientific American, Inc.
News and Analysis
32 Scientific American ... two Boe-
ing 747s were flying toward each
another along the same airway but sep-
arated vertically by a safe and whole-
some 2,000 feet. As the jets...
... faced with person-
nel changes and the vagaries of funding.
Keeping a lab’s Web server running and
up-to-date is a long-term commitment.
As opposed to the well-publicized ri-
valry between the HGP ... of vol-
unteers to perform an array of cognitive
tasks while they were exposed to simu-
lated cell-phone emissions from head-
sets. The emissions had no apparent ef-
fect on short- or long-ter...
... 4,650 4,400
12-BILLION-YEAR-
OLD AGE TRACK
15-BILLION-YEAR-
OLD AGE TRACK
NGC 288
NGC 362
Copyright 1992 Scientific American, Inc.
means that within the halo the only re-
maining main-sequence stars ... ßat-bot-
tomed cumulus clouds moved west-
ward on light trade winds. Calm seas
were rarely disturbed by squalls sweep-
ing into the northeastern Caribbean Sea
from the Atlantic Ocean. T...
... London
28 SCIENTIFIC AMERICAN January 1994
Copyright 1994 Scientific American, Inc.
V
ariously dry, wet or anywhere
between, wetlands are by their
nature protean. Such constant
change makes wetlands ... developers while pro-
tecting the ecological features of wet-
lands. Fluctuating water levels and the
sensitivity of wetlands to these chang-
es as well as the dependence of wet-
lands...
... looked
up and wondered. Well, as of two weeks
ago, we know.Ó ÑCorey S. Powell
SCIENTIFIC AMERICAN January 1996 23
Copyright 1995 Scientific American, Inc.
24 SCIENTIFIC AMERICAN January 1996
C
hecking ... The
organism remains susceptible to a top-
of-the-line antibiotic called vancomycin,
but authorities fear that may not last.
The American Society for Microbiolo-
gy reported...
... connec-
tions between its members can be inferred. Why flowering
trees suddenly proliferated in that period remains controver-
sial. The 80 taxa of charcoal flowers unearthed here, in combi-
nation ... PALSY”
F
o
r
e
!
T
r
i
c
k
s
o
f
t
u
r
b
u
l
e
n
c
e
s
t
i
l
l
d
e
f
y
s
u
p
e
r
c
o
m
p
u
t
e
r
s
Copyright 1996 Scientific American, Inc.
mother bought him an Apple II com-
puter and a 3...
... therefore able to
grow not only embryos with no
head but also ones that were noth-
ing but a head. The embryos were
not kept alive beyond about three
days, at which point an embryo
has only precursors ... For one thing, car-
bon and silicon do not mix well. “Car-
bon’s not that happy in that lattice,”
Sturm notes. To accommodate the un-
easy union, researchers have had to re-...
... real, why aren’t we un-
dergoing a renaissance unparalleled in
human history?” he demands, almost ir-
ritably. “I mean, why aren’t we duplicat-
ing the golden days of Athens or the Ital-
ian ... They
also noted the subjects’ other
health behaviors, such as exer-
cise patterns, smoking and drink-
ing, and looked at how all those
affected food choices. The al-
most 3,000 subjects were...
... traces.
To answer that, chemist John T. Arm-
strong of the National Institute of Stan-
dards and Technology used spectral-an-
alyzer software and a database contain-
ing high-precision x-ray measurements
to ... to-
gether like a jigsaw puzzle to produce
the 33.4-million-base-pair sequence.
The report,in the December 2, 1999,Na-
ture, also identified 11 gaps
—short
stretches of repetitious code...