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what does a sawfish use its saw for

What Does a Sawfish Use Its Saw for?

The rostrum, often referred to as the "saw", is used during feeding and for defense. The long, saw-like snout of a sawfish is used…

how does a zipper work

How Does a Zipper Work?

How Does a Zipper Work? A zipper, zip, fly or zip fastener, formerly known as a clasp locker, is a commonly used device for…

when were traffic lights first used

When Were Traffic Lights First Used?

When Were Traffic Lights First Used? You may think that the familiar red-green, traffic signal is a product of the automotive age. But actua

how is dry milk made

How Is Dry Milk Made?

Dry milk is made by evaporating the water from milk, so that only the milk solids remain. The purpose of drying milk is to…