Researchers disagree over how bad it is to be reinfected, and whether COVID-19 can cause lasting changes to the immune system. (Nature)
Asteroid’s comet-like tail Is not made of dust, solar observatories reveal | Scientists thought asteroid Phaethon, which is the source of the Geminid meteor shower, was shedding dust to form a comet-like tail, but NASA solar observatories show the tail isn't dusty.
China’s New Solar Observatory is Almost Ready for its Trials
