The feared tarantula isn't poisonous. A tarantula's bite can be painful, but it isn't any more dangerous than a bee sting.

Under a spider's abdomen, near the rear, are tiny stubs called spinnerets. The spider uses its legs to pull liquid silk made in its abdomen from the spinnerets. The silk hardens as it stretches. Since silk is made out of protein, a spider eats the used silk of an old web before spinning a new one.

On an American one-dollar bill, there is an owl in the upper left-hand corner of the "1" encased in the "shield" and a spider hidden in the front upper right-hand corner.

Most spiders belong to the orb weaver spider family, Family Aranidae. This is pronounced "A Rainy Day."

In the 1960s, animal behavior researchers studied the effects of various substances on spiders. When spiders were fed flies that had been injected with caffeine, they spun very "nervous" webs. When spiders ate flies injected with LSD, they spun webs with wild, abstract patterns. Spiders that were given sedatives fell asleep before completing their webs.

Horseshoe crabs and spiders are actually close relatives. The horseshoe crab belongs to the large group of invertebrates (animals without backbones) called Arthropods. This group also includes lobsters, crabs, insects, spiders, and scorpions. Even though it looks crab-like, with a hard shell and claws, the horseshoe crab is more closely related to scorpions and spiders than to crabs.

Many cultures believe that spiders bring good luck. The spider was popular with the Romans, who had a favorite mascot in the shape of a precious stone upon which a spider was engraved. Also they were fond of carrying little spiders of gold or silver, or any of the fortunate metals, to bring good luck in anything to do with trade.

Spider silk can stretch up to 50 percent of its original length. A strand of spider silk the width of a pencil could stop a Boeing 747 in flight.

On average, people fear spiders more than they fear dying. However, statistically, you are more likely to be killed by a champagne cork than by the bite of a poisonous spider.

We'd probably all be dead without spiders. Their sheer number makes spiders vital in maintaining the balance of nature. Because they structure insect communities wherever they occur, spiders play a vital role in the terrestrial food chain. Without all those hungry spiders, insect populations would explode, food crops would be decimated, and ecological balances ravaged. Humans would probably starve within a matter of months--if they hadn't already succumbed to various insect-borne diseases. No spider, incidentally, has been found to transmit disease.

Spider venom can be used to treat certain neurological and mental disorders. A research group in Utah has isolated components from the venom of many species of North American spiders, which may help reduce brain damage following strokes.

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