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  1. Same Difference: Twins’ gene regulation isn’t identical

    As identical twins go through life, environmental influences differently affect which genes are turned on and which are switched off.

    By Christen Brownlee

  2. 19567

    Why slam a copper impactor into Comet Tempel 1? Wouldn’t copper vapor contaminate the spray? Why not a high-temperature ceramic? P.M. deLaubenfelsCorvallis, Ore. According to Casey Lisse of the Deep Impact team, copper was chosen because its density put a lot of mass into a small package, its relative softness reduced bounce at impact, and […]

    By Science News
  3. Planetary Science

    A Grand Slam

    A 372-kilogram copper projectile released from NASA's Deep Impact spacecraft successfully slammed into Comet Tempel 1 on July 4, producing some heavenly fireworks.