Big dead galaxies (article at Science News)
Astronomers have found an unusually large cluster of galaxies 6.7 billion light-years away. This cluster is not only unusually big, the crowding of the galaxies has inhibited star-forming activity, as they pull hot gas out of each other gravitationally. It's in this sense -- no star-forming -- that the cluster is full of "dead" galaxies.
Dents from colliding universes (article at Discover Magazine)
Mix cosmology with string theory and you get the possibility that there are many universes, floating about in hyperspace, that might collide with each other. Now, galaxies should be distributed quite evenly in our universe, according to theory, and they mostly are, but there are some places where, for instance, all the galaxies are drifting in the same direction instead of randomly. These features, theorize some, may be "scars" or "dents" from collisions between our universe and another, back when both were very young.
Enzymes vs nerve scarring (article at Science Daily)
Damage to nerves, as in spinal injuries, doesn't heal because scar tissue forms quickly on the damaged nerves. Biologists have now found an enzyme that will digest away the scar tissue, and hope that this will leave the nerves free to heal.
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