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Animals

Comeback Bird

Looking for a long-lost woodpecker had its special challenges, including anticipating what would happen if the hunt actually succeeded.

Math

Knot an Interchange

Highway interchanges can get you into knotty situations.

Humans

From the June 1, 1935, issue

High-voltage circuit breakers, harnessing tides for electric power, and confirming the existence of the Sargasso Sea.

Earth

Sustainable Resource Use

This British Web site provides educational material about the sustainable use of resources, including water, waste management, textiles, and timber. It provides puzzles, experiments, worksheets, and lesson plans, with links to a wide range of environmental information.