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EarthFor European lakes, how clean is clean enough?
New research on lakes in Denmark suggests that agriculture has been affecting water quality there for more than 5,000 years.
By Sid Perkins -
Health & MedicineClot buster attached to red blood cells avoids complications
Attaching a clot-busting drug to red blood cells limits the drug's side effects, a study in animals shows.
By Nathan Seppa -
ChemistryChemical rings act as a minirotor
Interlocked molecular rings form new minirotors, including some in which scientists can control the rotational direction.
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Naps with stages spark learning
Napping shows potential as a way to stimulate learning.