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And Again? century ago. Fossils later found in China—notably the now lost 500,000-yearold (500 Kyr old) “Peking Man”—and elsewhere in Java were soon added to the species, and eventually H. erectus came to embrace a wide variety of hominid fossils, including a massive braincase from Olduvai Gorge known as OH9. 4 Myr, although it was originally thought to have been a lot younger. All these fossil forms possessed brains of moderate size (about 900 to 1,200 milliliters in volume, compared with an average of around 1,400 milliliters for modern humans and about 400 milliliters for apes), housed in long, low skull vaults with sharp angles at the back and heavy brow ridges in front.
CHARLES O’REAR CHARLES O’REAR C Combinatorial Chemistry and New Drugs Copyright 1997 Scientific American, Inc. Scientific American April 1997 69 to see whether the resulting peptides would bind to the particular antibody of interest, he rapidly found the active peptides from a large universe of possible molecules. In a parallel synthesis, all the products are assembled separately in their own reaction vessels. To carry out the procedure, chemists often use a so-called microtitre plate—a sheet of molded plas- tic that typically contains eight rows and 12 columns of tiny wells, each of which holds a few milliliters of the liquid in which the reactions will occur.
How this principle actually comes into play is clearer when applied to the structure of subatomic particles. Suppose that Windbag, whose cable is also equipped with a powerful microscope, watches an atom fall toward the horizon. At first he sees the atom as a nucleus surrounded by a cloud of negative charge. The electrons in the cloud move so rapidly they form a blur. But as the atom gets closer to the black hole, its internal motions seem to slow down, and the electrons become visible. The protons and neutrons in the nucleus still move so fast that its structure is obscure.
[Magazine] Scientific American. Vol. 276. No 4
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