Mountain ranges rise where a sea once met a shore. They start to form when a sea bottom along the edge of a continent begins to fill up with mud and sand. As the mud and sand grow thicker, the sea…
A strange shape moved slowly through the dark-blue water of a tropical sea. It looked like a see-through umbrella. But instead of a handle, it had ragged, lacy strips and strings hanging down from…
> A harvester ant goes to work every day. Why do birds sing? Why do ants rush about so busily? Why does a mandrill sometimes seem to yawn when it sees another animal? Are there reasons for what the…
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