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Science  17 Sep 1999:
Vol. 285, Issue 5435, pp. 1815d
DOI: 10.1126/science.285.5435.1815d

Circuit breakthrough. The transistor, essentially an on-off switch inside an electrical circuit, is regarded as one of the century's most important inventions. This PBS site covers the history, science, and personalities involved in the 1947 Bell Labs invention that led to everything from vacuum tube-less radios to today's Pentium computer chips. Accompanies a TV show airing on 8 November.

Skyshopping. A new window on the planet opens for business this month as NASA begins selling photos (around $600 a pop) from the Landsat 7 Earth-observing satellite launched last spring. Visit the gallery to see highlights from the last few weeks, such as icebergs off Antarctica, sand dunes in Australia, and a crisp, 30-meter-resolution snapshot of Manhattan.

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