News
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		EarthTainted by Cleanser: Antimicrobial agent persists in sludge
About 76 percent of a commonly used antimicrobial agent exits sewage-treatment plants as a component of the sludge that's often used as a farm fertilizer.
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		Wired for math
The same neural circuits that adults use to perform complex calculations are already at work in preschoolers doing basic math.
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		HumansClinical trials really pay off
Large-scale human trials of new treatments in medicine have the potential to offer huge economic benefits from improved quality of life.
By Janet Raloff - 			
			
		PhysicsConfined gas rejects compromise
Pairs of tiny gas clouds of unequal energies mixing inside narrow tubes retain their original energy differences.
By Peter Weiss - 			
			
		AnimalsJust turn your back, Mom
A female in a species of legless amphibians called caecilians nourishes her youngsters by letting them eat the skin off her back.
By Susan Milius - 			
			
		Health & MedicineLiver regeneration tied to bile acids
Bile, a digestive juice, plays an integral role in the regeneration of liver tissue.
By Nathan Seppa - 			
			
		Health & MedicineTwo drugs are equal in preventing breast cancer
A commonly prescribed anti-osteoporosis drug works as well at preventing breast cancer as the sole drug currently prescribed for the task.
By Nathan Seppa - 			
			
		HumansStudy finds bias in peer review
Researchers have found evidence of bias when scientists review data and the researcher's name and affiliation are available to the reviewers.
By Janet Raloff - 			
			
		AnimalsBird hormone cuts noise distractions
A jolt of springtime hormones makes a female sparrow's brain more responsive to song.
By Susan Milius - 			
			
		Health & MedicineSmall Wonder: Taking the bite out of anthrax toxin
Using a submicroscopic synthetic blob called a liposome, scientists have neutralized anthrax toxin in rats.
By Nathan Seppa - 			
			
		AnimalsGrammar’s for the Birds: Human-only language rule? Tell starlings
A grammatical pattern called recursion, once proposed as unique to human language, turns out to fall within the learning abilities of starlings.
By Susan Milius - 			
			
		AstronomyEnergy-Saving Space Engines: Black holes can be green
Some seemingly quiet black holes are actually efficient engines that emit jets of high-energy particles.