Concerns prompt reexamination of atrazine’s safety (p. 18)

Scientists study H1N1’s past to predict what  the virus has in store (p. 22)

Entangled photons validate Feynman’s vision for simulating nature (p. 28)

Researchers making neurons bypass the need to revert cells to an embryonic state. (p. 5)

Satellite images reveal new aspects of Big Bang’s relic radiation. (p. 7)

Six years into its 90-day mission, NASA’s rover becomes a lander (p. 7)

In species with pregnant males, females may put something extra into eggs. (p. 8)

New species have evolved at a surprisingly rapid pace, new study suggests (p. 8)

Analysis of a fossil suggests plumage first evolved for display, not flight. (p. 9)

Researchers find microscopic structures in some fossils that may have held pigments. (p. 9)

A new study finds that proteins used in photosynthesis take advantage of electrons’ wavelike properties (p. 10)

A computer simulation finds that leaves' circular networks are efficient at getting around damaged spots and varying distribution load. (p. 10)

A decline in stratospheric water vapor has slowed Earth’s surface warming slightly in recent years. (p. 11)

Electrode-tipped catheter destroys heart tissue to stifle atrial fibrillation, sometimes performing better than meds, study shows. (p. 12)

Scientists identify a key proton channel that helps explain the dash to fertilization. (p. 12)

Study in slugs hints that some molecular 'misbehavior' in neurons may help solidify learning. (p. 13)

Women taking the antidepressant drugs began lactating later. (p. 13)

A genetic analysis of a skeleton from an ancient Asian tomb illuminates the spread of Indo-Europeans. (p. 14)

A new study finds that going shoeless tempers impact but can’t say whether this difference reduces injuries. (p. 14)

President’s proposed FY 2011 budget outlines 5.9 percent increase in nondefense-related research and development funding. (p. 16)

(p. 4)

(p. 4)

Review by Erika Engelhaupt (p. 30)

Review by Kristina Bartlett Brody (p. 30)

(p. 30)

(p. 30)

(p. 30)

(p. 30)

(p. 30)

(p. 32)