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All Stories by Rebecca E. Hirsch
Health & Medicine
High school girls and those with a history of concussions appear to take longest to recover.
Chemists have created a new way to convert carbon dioxide into ethanol. It might one day help remove excess CO2 — a greenhouse gas — from the air.
Monarch caterpillars eat only milkweeds. A new study finds widespread pesticide use has tainted these plants across the insect’s western U.S. breeding grounds.