منابع مشابه
Ancestor to Call Our Own
Controversial new fossils could bring scientists closer than ever to the origin of humanity POITIERS, FRANCE—Michel Brunet removes the cracked, brown skull from its padlocked, foam-lined metal carrying case and carefully places it on the desk in front of me. It is about the size of a coconut, with a slight snout and a thick brow visoring its stony sockets. To my inexpert eye, the face is at onc...
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Humans have a skewed view of viruses because we only notice them if they cause disease. In reality, however, viruses are much more than pathogens. HIV and influenza cause frightening health threats, but 1019 HIV particles worldwide are basically nothing compared to 1033 total number of viruses on our planet. Viruses are present in every species and every ecological niche, and affect every organ...
متن کاملThe Ages and Chemistry of the Oldest Stellar Halo Populations
NGST is capable of reaching the main sequence turnoff of the oldest stellar populations (MV = +4.5) out to a distance ≈ 2 Mpc. There is now evidence that the oldest, most metal poor star clusters are coeval to within 1 Gyr over a 200 kpc radius centered on the Milky Way. NGST can be used to make an equally definitive test of this in the halo and globular cluster system of M31, NGC 147, 185, and...
متن کاملAging increases inattentional blindness to the gorilla in our midst.
When engaged in an attention-demanding task, people are surprisingly vulnerable to inattentional blindness--the failure to notice an unexpected event. Two theories of cognitive aging, attentional capacity models and inhibitory deficit models, make opposite predictions about age differences in susceptibility to inattentional blindness. We tested these predictions using an inattentional blindness...
متن کاملFracture toughness of mountain gorilla (Gorilla gorilla beringei) food plants.
Mountain gorillas, the largest extant primates, subsist almost entirely on plant matter. Moreover, their diet includes a substantial amount of structural material, such as bark and stems, which other primates tend to avoid. Accordingly, the robust masticatory apparatus of gorillas may be adaptive to this presumably tough diet; however, quantitative information on this subject is lacking. In thi...
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ژورنال
عنوان ژورنال: Nature
سال: 2007
ISSN: 0028-0836,1476-4687
DOI: 10.1038/448844a