The latest advances from the field of DNA nanotechnology include nanobot ‘spiders’ learning how to walk and even do some work. (p. 18)

A material that oozes through itself presents a super physics puzzle (p. 22)

Amphibians and other sensitive groups encounter chemicals across the landscape (p. 28)

Controversy arises over whether bacteria have completely gobbled oil up. (p. 5)

Animal bones found in East Africa show the oldest signs of stone-tool use and meat eating by hominids. (p. 8)

As overall crime rates declined in the United States, certain poor communities fueled a dramatic rise in incarceration rates. (p. 9)

People who retire on the early side tend to feel better physically and emotionally than those who quit working earlier or later. (p. 9)

In high school, students with depression seek — rather than settle for — friends with similar moods. (p. 9)

Thousands of volunteers help discover a neutron star by donating the processing power in their idle home computers. (p. 10)

A panel of astronomers ranks proposed astrophysics projects for the coming decade. (p. 10)

New pictures expand evidence of the moon’s shrinkage over the past billion years. (p. 11)

A faint object was once thought to be the first extrasolar planet to be photographed. Then it wasn’t. But now it may go down in the history books after all. (p. 11)

A stealth approach to echolocation appears to be adaptive for catching eared moths. (p. 12)

Odd shapes in Australian rocks could be the oldest fossil evidence of multicellular animals. (p. 12)

New variety of photosynthetic pigment is the first to be discovered in 60 years (p. 13)

The percentage of adolescents with some decline has increased since the 1990s, a study shows. (p. 14)

A molecular profile may help doctors predict who will get sick from TB infections. (p. 14)

Extra nuclei produced by training survive disuse, making it easier to rebuild lost strength. (p. 15)

Oxygen atoms arrange themselves in a self-similar pattern to help conduct electricity without resistance. (p. 16)

Drip by drip, a new machine freezes out an existing theory. (p. 16)

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Review by Camille M. Carlisle (p. 30)

Review by Elizabeth Quill (p. 30)

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