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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Angles
What Is an Isosceles Triangle?
What Is an Isosceles Triangle? An isosceles triangle has two equal angles (and two equal sides). The angles can vary, as long as two are equ
How Do We Measure the Height of a Mountain?
How Do We Measure the Height of a Mountain? Most of our figures for mountain heights were obtained with an “altimeter.” This is kind of baro
What Makes a Boomerang Fly?
What Makes a Boomerang Fly? Boomerangs used most famously by the Australian Aborigines use a very complex combination of physics and aerodyn
Why Are Rainbows Curved?
Rainbows are curved because the raindrops that reflect the light are curved themselves. The arc of color you see is just part of the…