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The Genetic Bases of Sex and a First Anti-Malaria Vaccine |
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The biology books say that sharks and rays make the group of cartilaginous fish, less evolved than most of the other species, that make the group of the bonny fish. Still, sharks, with their highly developed senses and teeth, make the top predators of the seas. Paradoxically, the two largest species of shark, that m... |
22 March 2008
07:53 GMT |
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In nature, any species is sought after by other predator or prey species, which detect it through their senses (sight, hearing, smell). Victims can defend through venoms, unpleasant smells, run, or by deceiving the sensory input of their predators. One method is camouflage and mimicry. It is a balance between prey an... |
22 March 2008
08:44 GMT |
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Paleolithic is the period that makes most of our history. It started with the oldest known stone tools, 2.6 Ma ago and lasted until 10,000 years ago. It emerged with Homo habilis and reached its peak with our species, Homo sapiens, which appeared about 200,000 years ago. It is the period when humans were just hunters... |
24 March 2008
17:11 GMT |
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HIV does not kill by itself. It just leaves humans defenseless against other killers. About 50% of all HIV-positive African adults die of Salmonella infection, a disease that otherwise is treated after a seven-day bout of diarrhea. A new research made at UC Davis School of Medicine and published in the "Nature Medici... |
25 March 2008
14:06 GMT |
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The Neolithic (New Stone Age) was a period in the technological development of Homo sapiens that started at the end of the Ice Age, 10,000 years ago, and ended around the Mediterranean Sea and other areas about 5,500 years ago, when the Bronze Age started.It was the period when first human settlements appeared. Peopl... |
25 March 2008
12:27 GMT |
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A man will spend money on expensive gifts, best wine, finest sweets and flowers. But in the murky waters of the Amazon, boto or the Amazon River dolphin (Inia geoffroyensis) (which also inhabits the Orinoco River) males offer branches, rocks, weeds and lumps of clay to their females, in a parade also intended to cha... |
26 March 2008
14:06 GMT |
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Sharks gained their dominance in the seas owing to their formidable teeth-jaws, speed and senses. For hunting, sharks are endowed with keen sight, olfaction and hearing (they pick up sounds from 2 km (1.2 mi) away). The lateral line helps them detect vibrations produced by a struggle in the water, like the convulsion... |
28 March 2008
07:46 GMT |
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In the world of the building materials, bamboo could compete successfully against steel, concrete, wood and glass. Because of its exceptional mechanical qualities, low price and design, bamboo could turn into one of the preferred building materials of the future. Even if it looks like a tree, the bamboo is just a woo... |
29 March 2008
09:02 GMT |
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The smell of a certain perfume can make you remember a lost love, while some stenches can bring you back unpleasant memories about an annoying ex co-worker. A new research made at Northwestern University and published in the journal "Science" shows that emotions are strongly connected to the olfactory sense, which ca... |
31 March 2008
03:04 GMT |
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This is a breakthrough in explaining egg fecundation and a research that could help us fight against many deadly bugs. A team made of researchers from UT Southwestern Medical Center and Imperial College London has described the basic gene mechanism of reproduction, in a research published online in the journal "Genes... |
31 March 2008
05:21 GMT |
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