An extraterrestrial object apparently exploded above Canada about 12,900 years ago, sparking devastating wildfires and triggering a millennium-long cold spell. (p. 339)

A fetus can manufacture immune cells and antibodies in direct response to vaccine given to the mother during pregnancy. (p. 339)

By throwing their bodies into tiny potholes on rough trails, army ants enable their comrade to race over them, improving the colony's overall foraging success. (p. 340)

Subtle features in X-ray images of tumors let radiologists infer which genes are active in the cancerous growth. (p. 341)

Chemicals that prevent grease from seeping through food packaging can transform into a suspected carcinogen. (p. 341)

Kindergartners can solve relatively complex addition and subtraction problems if allowed to use their intuitive grasp of approximate quantities rather than being required to calculate exact solutions. (p. 341)

Novel circuits use electrons as tiny bar magnets to process information. (p. 342)

Sensors and other electronic devices that can scavenge energy could open a new realm for technology. (p. 344)

The health of corals, and their adaptability in the face of adversity, may rest largely on the microbes they recruit into a slime that coats their surfaces. (p. 346)

Insulin-producing cells in the pancreas proliferate by cell division, unlike other body tissues, which regenerate from adult stem cells. (p. 350)

The action of Saturn's gravity is responsible for plumes of water vapor shooting out from cracks on the moon Enceladus. (p. 350)

An X-ray experiment has yielded the most conclusive evidence to date that carbon can be magnetic. (p. 350)

Seismic instruments could be used to estimate the amount of ice that shears away from glaciers as they flow into the sea, offering a way to better estimate sea level rise due to the breakup of those ice masses. (p. 350)

(p. 351)