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Meteorites may have sparked life on Earth
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Stone Tablet May Solve Maya Mystery
Untangling Human Origins
Words of the Distant Past
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Sting Ray
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Eat Out, Eat Smart
Moving Good Fats from Fish to Mice
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What Not to Say to Emerging Readers
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Tracking the Sun Improves Plant Pollen
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A Family in Space
Baby Star
An Earthlike Planet
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Young Scientists Take Flight
Dancing with Robots
Crime Lab
The Parts of Speech
What is a Noun
Countable and Uncountable Nouns
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Transportation
How to Fly Like a Bat
Robots on a Rocky Road
Robots on the Road, Again
Weather
Earth's Poles in Peril
Science loses out when ice caps melt
The Best Defense Is a Good Snow Fence
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Sticky Silky Feet

Comic book superhero Spider-Man uses tiny hairs on his fingertips to climb up walls. But he could have had another secret weapon to help him stick. Scientists have now found that some spiders can also make silk in their feet, which may sometimes help them get a firmer grip on a surface. Spiders are good at gripping walls with their legs. Thousands of little hairs on their feet make it possible. To test whether spiders also make these hairs wet to improve grip, scientists watched zebra tarantulas crawl up glass slides. When they tilted a glass slide until it was almost vertical, the spider slipped a few millimeters before attaching itself again. The scientists were surprised to see little threads stretching from its feet to the slide. When they studied the spider's feet under a special microscope, they found tiny silk-shooting spouts among the hairs. This was a surprise because scientists had previously thought spiders only use special organs near their stomachs to make silk. It's possible that, a long time ago, feet were the first body parts of spiders to produce silk. Only later in their evolutionary history did spiders develop spinnerets on their abdomens to produce silk for webs. If so, the researchers say, this could mean that the silk's original purpose was to help spiders climb and stick, rather than to build homes or trap prey.—C. Gramling

Sticky Silky Feet
Sticky Silky Feet








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