Photo of the day

Photo: Red lights of the Belle Époque

On this day, the Moulin Rouge opened in Paris.

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Photo: A toxic red wave

A flood of contaminated mud rushes through villages in Hungary.

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Photo: Up your nose

Pick your favorite president!

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Photo: To infinity and beyond!

Today it’s an educational theme park, but it was originally intended as a utopian city of the future.

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Photo: A real change-up

On this day in 1947, baseball’s Fall Classic saw several firsts.

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Photo: Cow-abunga!

An itty-bitty bovine makes a big name for herself.

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Photo: Hey, let’s hang out!

Spread the word: It’s World Rabies Day.

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Photo: Build a bigger mousetrap

More photos: Slideshow: Science meets circus at the World Maker Faire

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Need to Know is a production of Creative News Group (CNG) in association with WNET. Marc Rosenwasser is Executive Producer. Need to Know is made possible by Bernard and Irene Schwartz, Mutual of America, Citi Foundation, John D. and Catherine T. MacArthur Foundation, Miriam and Ira D. Wallach Foundation, Margaret A. Cargill Foundation, The Corporation for Public Broadcasting and PBS.