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If rainbows are circular, why do we only see arches?

Seeing a rainbow can feel like a reward. After a violent thunderstorm, it's nice to spot a colorful arch crossing the calming sky. But you might (or might not) be surprised to know that rainbows aren't really arches, nor are they "bows."…

How Stonehenge worked

Eight miles (13 kilometers) north of Salisbury in Wiltshire, England, U.K., lies Stonehenge — an enormous circle of stones. It's an ancient monument that was of great significance to the people who erected it.