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People flocked to the streets during Paris' car-free day.

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A Car-Free Day in Paris Cut Pollution by 40 Percent

But will the city say <i>non</i> to smog for good?

Cool Finds

How the Tetris Theme Song Was Made

A small piece of hardware produced the iconic sounds of gaming

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5 Things to Know About Svetlana Alexievich, Winner of the 2015 Nobel Prize in Literature

The Belarusian journalist is best known for her tragic investigations of war and disaster in eastern Europe

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The Draconid Meteor Shower Peaks This Week

Clear skies and little moonlight make for great meteor watching

An artist's interpretation of what ancient Mars may have looked like

New Research

The Past and Present of Mars Look Wetter and Wetter

From salty streaks of flowing water to an ancient system of rivers and lakes, Mars seems more hospitable to life than previously thought

Screenshot from "Live Texturing of Augmented Reality Characters from Colored Drawings" video

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Thanks to Augmented Reality, These Coloring Books Come to Life

The new technology takes 2D pictures and turns them into 3D magic

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Listen to the Sweet Sounds of Slime Mold

Two artists transform the bioelectricity of microorganisms into song

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The Only Eyewitness Painting of Lincoln's Assassination Is Finally Being Restored

How a forgotten portrait of the president's dying hours was saved

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Cool Finds

Watch Drones Drop Thousands of Moths on Crops

Swarms of sterile moths could be coming to a cotton farm near you

A scene from 1963's Jason and the Argonauts

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Ray Harryhausen's Movie Memorabilia Goes Up For Auction

Sketches, models, and a treasure trove of collectibles from Hollywood's first king of special effects

New Research

Ancient Romans in Pompeii Had 'Perfect Teeth'

A new study reveals what life was like in Pompeii — and how it ended when Mount Vesuvius erupted

New Research

Another Step Closer to Male Birth Control Pills

A protein might lead to an oral contraceptive for men

Gilgamesh statue at Sydney University

Cool Finds

Iraqi Museum Discovers Missing Lines From the Epic of Gilgamesh

One of the world's first great stories just got a new chapter

The hand and foot of Homo naledi

New Research

The Increasingly Muddled Origins of Homo Naledi

Detailed analyses of Homo naledi shows a mosaic of both early and modern human features

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ISIS Demolished Yet Another Priceless Syrian Monument

The 1,800-year-old Arch of Triumph was destroyed on Sunday

Sears sweater models...or government agents?

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In Vietnam, the C.I.A. Paid Spies With Stuff From Sears

Nothing says "clandestine espionage" like a mail-order catalog

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Feast Your Eyes on an Optical Illusion Cake

This may be the most delicious optical illusion

New Research

What Cyclists Can Learn From Schools of Fish

A weaker athlete might be able to keep up if they stay to the back of a group

New Research

Butt Dials Blamed for a Spike in 911 Calls

Reports put accidental pocket dials at 30 to 50 percent of mobile emergency calls

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How Decorative Gourd Season Conquered Fall

Strange-looking squash have become big business for farmers

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