DJ Frankie Knuckles plays at the Def Mix 20th Anniversary Weekender at Turnmills nightclub on May 6, 2007 in London, England. Claire Greenway/Getty Images/Getty Images Europe hide caption
Time Machine: The Throughline History Quiz How much do you remember?
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Special Series
Time Machine: The Throughline History Quiz
Painted portrait of Wong Kim Ark in the Asian American Community Heroes Mural, located in San Francisco's Chinatown. Julie Caine/Chinese Culture Center of San Francisco hide caption
There's more plastic waste in the world than ever. So, where did the idea come from that individuals, rather than corporations, should keep the world litter-free? Tim Boyle/Getty Images hide caption