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These rainbows are caused by some of Nancy's prisms. Why is there no green in these rainbows?
The colors of a butterfly's wings are caused by tiny scales. Do they all produce colors in the same way?
What makes a house cat's eyes so very different from a Lion's eyes?
I took this photo on a boat excursion on the Colorado River. A recent comment asked why the sky is blue. OK, so why is the sky blue? And why is it bluer on some days and less blue on others?
Why does the Sun seem flattened instead of round at sunrise and sunset?
This is a science demonstration that is often used as a magic trick, to make a coin suddenly appear. It is a very easy trick. All you have to do is change the speed of light.