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All Stories by Allison Gasparini
Eight billion people now live on Earth — a new record
The global population hit this milestone on November 15, according to an estimate from the United Nations.
Explainer: What are the different states of matter?
Most people know solids, liquids and gases — but what about the four other states of matter?
Some of the sun’s iconic coronal loops may be ghostly illusions
Wrinkles in the sun’s outer atmosphere might trick the eye into seeing glowing arches, scientists now report.