Study of huge Ancestry.com pedigree set suggests similar life spans between spouses may have inflated previous estimates of life span heritability

Many commercial strains nearly genetically identical

Genes active in the brain implicated in differences in rats selected for aggression or tameness

New method opens window on invisible world.

The loblolly pine genome is big. Bloated with retrotransposons and other repetitive sequences, it is seven times larger than the human genome and easily big enough to overwhelm standard genome assembly methods.