John Vachon/U.S. National Archives/Flickr

15,000 photos that inspired EPA

Love historical photo galleries? Here’s one about science. Shortly after U.S. President Richard Nixon established the Environmental Protection Agency (EPA) in 1970, the agency started a documentary project to chronicle environmental problems and its efforts to improve them, Fortune writes. The online gallery of 15,000 images is a mix of seemingly random cultural shots (like a barefoot, hitchhiking man wearing flower-print patched jeans and holding a puppy) and photos that clearly show the health and environmental issues—such as unchecked fumes and trash pilesEPA sought to clean up.