Partial remains of two skeletons were discovered in a cave in South Africa, and some scientists think they may be another addition to humanity's evolutionary tree.

Observable change is happening in humans, albeit slowly and only for certain traits. Scientists have tracked the histories of 14,000 residents of Framingham, Massachusetts, since 1948. Data from 2,238 females participating in the Framingham Heart Study were recently analyzed, including weight, blood pressure, cholesterol levels, and number of offspring.

Good neighborhoods provide families a lot of protection, but even the best of communities remain vulnerable to the threat of criminals invading their homes. Our human bodies are also vulnerable to foreign invaders such as bacteria, viruses, fungi, and parasites.

A boom in affordable housing in the 1950s was helped by the invention of a distinctive multifunctional piece of equipment: the backhoe. Its strong yet relatively slender articulated arm allowed precise yet rapid placement for digging or lifting. The manipulative device is trim and fast, since hoses transfer power to it from a powerful hydraulic pump within the main chassis.