LifeWe can see evidence of the ancient Snowball Earth in bacterial DNA The photosynthetic bacteria that thrive in warm ocean waters today nearly died out when the entire planet froze over 680 million years ago – and there is evidence of that frozen world in their DNA ¿ìè¶ÌÊÓÆµ
HealthFirst case of coronavirus reinfection leaves big questions unanswered A man appears to have caught two lineages of the coronavirus around four and a half months apart, suggesting people can be reinfected with the virus after making a recovery – but there is much we still don't know Analysis