What Will Happen to Each Screw?
Take a close look at the two screws below. Suppose they were both turned in a counter clockwise rotation. What will happen to each screw?
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Threads
How Does a Spider Spin Its Web?
How Does a Spider Spin Its Web? A spider spins a web out of silk that it makes inside its body. The silk comes out in thin liquid threads th
Why Doesn’t a Spider Get Caught in Its Own Web?
Why Doesn’t a Spider Get Caught in Its Own Web? Spiders build their webs to trap flies and other insects for food. An insect is unable to
How Does a Sewing Machine Sew?
How Does a Sewing Machine Sew? Most home sewing machines sew with two threads. An exposed thread fits through the needle’s eye. Another thre
How Does a Spider Make Its Silk?
Spiders make their own silk. They take the protein from the insects that they eat, break them down, and build them up into web proteins. Spi