Once called "America's Best Idea," national parks have preserved wide swaths of the country's most magnificent scenery and geological history for millions to enjoy every year. But as popular as these parks are, many visitors are unaware of the surprising features they contain.
Humans have been fascinated by twins for thousands of years. While scientists understand the egg-splitting process that creates twins, researchers aren't so sure about why it happens. Celebrate these dynamic duos with the five facts about twins below.
The human body holds a host of extremes. These six facts explore those extremes and illuminate the importance of the tiniest bones and the most vital organs.
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