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Science  17 Dec 1999:
Vol. 286, Issue 5448, pp. 2227
DOI: 10.1126/science.286.5448.2227d

Making light of computers. Photonic crystals, tiny latticelike structures that channel photons, may pave the way for computers that calculate at light speed. The Ultimate Collection of Photonic Band Gap Research Links boasts more than 500 links to research groups around the world, news articles, patents, software, tutorials, and conferences.

Stem cell hotbeds. As hopes grow for treating diseases with human embryonic stem cells, Science's Breakthrough of the Year, scientists will be closely watching whether Congress intervenes to restrict this research. For a summary of where things stand, see Offering daily news articles and other links is

Navigating the genome. Offering a sort of road atlas for finding genes is the Genome Channel, a site packed with pop-up Java windows that let you zoom in from chromosomes to annotated DNA sequences. Links take you to sequencing centers for 24 organisms, including humans, mice, and E.

Microwave hunt shapes up. Probing whether space is curved or flat, cosmologists have been searching for clues in ripples in the universe's microwave background left from the big bang. These tutorials explain the cosmic microwave background for neophytes, as well as intermediate and advanced readers.∼whu/physics/physics.html

Worlds apart. Astronomers this year upped their tally of planets outside our solar system to nearly 30 and found the first direct evidence of these worlds when they noticed one crossing its star. This handy page of links on exoplanets includes a table of all candidates found so far.∼eem/exo.html

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