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Why Do Plants Have Sap?
Why Do Plants Have Sap? Sap is the liquid that enables trees and other plants to live and grow. The roots of a plant…
Why Is Popcorn the Only Kind of Corn That Pops?
Why Is Popcorn the Only Kind of Corn That Pops? While popcorn is growing in the field, it looks much like any other kind…
How Is Glass Made?
Ordinary glass is made from clean, white sand and two white, powdery chemicals known as soda and lime. Just plain sand can be made…
How Does an Escalator Work?
How Does an Escalator Work? An escalator is an endless chain of moving steps pulled round and round by a strong electric motor. An…
What Are Black and Blue Marks?
What Are Black and Blue Marks? Black-and-blue marks indicate bleeding under the skin. When we receive a sharp blow, tiny blood vessels break