How Were Water Clocks Used?
How Were Water Clocks Used? A water clock uses a flow of water to measure time. If viscosity is neglected, the physical principle required t
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What Makes an Echo?
What Makes an Echo? An echo is a sound that we hear after it is reflected, or bounced back, from some object. When we shout, sound waves tra
How Far Away Is the Horizon?
The distance to the horizon, the imaginary line where the sky seems to meet the earth, depends on how high our eyes are above the level of t
What Causes a Rainbow?
What Causes a Rainbow? After a shower of rain there is often a rainbow. Rainbows form when the sun begins to shine through the clouds while
How Many Sides Does a Rainbow Have?
When I see a Rainbow, can People see the other side? or How many sides does a rainbow have? Children love to ask why…