One of these is scent. Scent is an ancient signalling system. The Scent of Eros is an excellent source of scientific studies and popular articles documenting that point. The most impressive word guide since the Oxford English Dictionary. EZ Search Form Detailed information on just about any book ever published in the English language.
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The ultimate bibliophilic treasure. The entries are skimpy, but more than usable. And it is ever so handy to have a complete bibliographic dictionary online. The quickest way to swallow a day's worth of science news in a single gulp. This is where the science news shows up first.