What Is a Hologram?
A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and th
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Shapes
How Are Toy Balloons Made?
How Are Toy Balloons Made? The balloons you see at the circus or a birthday party began as latex, the milky liquid of rubber trees. In the b
What Is a Gourd?
Did you ever see a fruit with rind hard enough to use as a cooking pot? A gourd is such a fruit. Gourds are ornamental fruits that are close
How Does Coral Grow?
How Does Coral Grow? Beneath the surface of the sea lie coral formations of many shapes and colors. The formations may look like branching t
How Do Clouds Change Shape?
How Do Clouds Change Shape? Clouds are made mostly of tiny droplets of water floating about on currents of air. On a windy day, the air curr