Nuclear power plant. Free public domain CC0 photo.
Buying lettuce in a grocery store. Via Rawpixel
Masks worn during experiments with plague. Manila, Philippines (1912). Original image from National Museum of Health and Medicine. Digitally enhanced by rawpixel.
Green coronavirus under a microscope. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.
