What Makes People from Different Parts of the World Have Different Skin Colors?
People noticed long ago that people from different parts of the world often had different skin colors. For example, people who liv
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Why Do Dogs Moult?
Why Do Dogs Moult? Dogs normally moult every year in late spring. As the weather becomes warmer the dog’s body temperature is naturally kept
Why Does Hair Turn Gray?
People with gray or white hair didn’t always have hair that color. Their hair may once have been black or brown, light blond or flaming red.
What Makes the Wind Blow?
What Makes the Wind Blow? Wind is air in motion. Wind is caused mainly by the uneven heating of the air around the earth by the sun. Since t
Why Does Ice Float?
Ice is able to float because it is lighter than water. Water greatly expands as it freezes into ice. Ten quarts of water produce about eleve