Scientists research adverse reactions to the COVID-19 vaccine
A rare giant tortoise makes an appearance after more than a century
Research crew pulls core sample from the deep sea
Chinese scientists measure highly energetic gamma waves
Biden administration reverts to tougher enforcement of rare bird protections
Virus variants hit just as public gatherings increased
New technology could kill off disease-spreading insects
Project clears trash from remote Hawaiian atolls
Scientists make a breakthrough in efforts to combat malaria
