LifeSponge fossils suggest animals already existed 890 million years ago The preserved remains of sponges found in Canada suggest that animals may have originated 350 million years earlier than we thought ¿ìè¶ÌÊÓÆµ
HealthThe surprising, ancient origins of TB, humanity's most deadly disease New developments in a 10,000-year-old cold case have upended our ideas about how and when tuberculosis began infecting humans – and offered hope for a better vaccine Features