How the Alien Genome Within Us Affects When We Die and Why We Have 2 Sexes
This post was originally published at Ed Yong's Discover blog, Not Exactly Rocket Science. Two people are dancing a waltz, and it is not going well. One is tall and the other short; one is graceful, the other flat-footed; and both are stepping to completely different rhythms. The result is chaos, and the dance falls apart. Their situation mirrors a problem faced by all complex life on Earth. Whether we’re animal or plant, fungus or alga, we all need two very different partners to dance in step