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Dark matter on the map

Cosmologists have mapped the first 3-D representation of that mysterious non-substance in space, dark matter. The rendering was constructed from Hubble Telescope photos of areas where visible matter appears to be bending toward dark matter's gravitational pull.

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New source of stem cells discovered

In the latest twist on the stem-cell research controversy, researchers have extracted stem cells from amniotic fluid that are similar to those taken from embryos. The debate over whether they could viably substitute for embryonic stem cells rages on.

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