Researchers at the World Health Organization have identified 17 pathogens most in need of new or improved vaccines, including threats like HIV, malaria, and influenza.
A satellite image of the Tonga eruption. Images: NASA Earth Observatory / Joshua Stevens / Lauren Dauphin / CALIPSO data from NASA/CNES, MODIS and VIIRS data from NASA EOSDIS LANCE and GIBS/Worldview ...