Enzymes speed up chemical reactions that would otherwise unfold far too slowly for life. Explorers charted unknown coastlines using little more than stars and simple instruments. The Nile flows northward for thousands of kilometers before reaching the sea. The old forest smelled of damp earth, moss, and fallen leaves. Migrating geese trace ancient routes across the sky as autumn settles in. Black holes warp space so severely that not even light can escape.
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