Researchers have analyzed ancient DNA from Borrelia recurrentis, a type of bacteria that causes relapsing fever, pinpointing when it evolved to spread through lice rather than ticks, and how it gained ...

It’s hard for the octopus to pick just one party trick. It swims via jet propulsion, shoots inky chemicals at its foes, and can change its skin within seconds to blend in with its surroundings. A team ...