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Tech

Invention Playhouse

Aimed at children, the “Invention at Play” Web site offers a variety of interactive activities to encourage and exercise creativity. Developed by the Lemelson Center for the Study of Invention and Innovation, the site accompanies a traveling exhibit that looks at similarities between the way children play and creative processes used by science and technology […]

Math

Solving Yahtzee

Sometimes described as poker with dice, Yahtzee is an immensely popular game. Its manufacturer, Hasbro, claims that as many as 100 million people worldwide play the game regularly. Yahtzee involves rolling five dice with the aim of obtaining favorable scoring combinations. For example, rolling five of a kind scores 50 points, whereas rolling three of […]

Earth

Fallen Trees? Scotch pines emit nitrogen oxides into the air

Northern pine forests may exude nitrogen oxides—a contributor to smog and acid rain—in quantities that rival those produced by industry and traffic worldwide.