Today, we know that washing our hands is one of the most important steps we can take to avoid getting sick and spreading germs.

But how we came to know that is pretty fascinating.

Image via iStock.

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This famous painting was just transformed into 3D touchable art for the visually impaired.

A museum in Vienna is making sure everyone, including the blind and visually impaired, gets to experience art.

You might recognize "The Kiss," a famous painting that lives in the Belvedere Museum in Vienna.

More properly known as "The Kiss (Lovers)," the painting was created between 1907 and 1908 by the Austrian painter Gustav Klimt. It's done in oil and gold leaf. It's pretty famous, so you've probably seen it before, although you might have not known the name.

Over a million people come to Vienna to see the painting every year.

Photo by Dieter Nagl/AFP/Getty Images.

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While world leaders were traveling to Paris to attempt to finally agree on what to do about climate change, people all over the world got together to hold their feet to the fire.

The ostensible goal of the COP21 conference in France is to produce a legally binding agreement that will help reduce emissions and slow down global warming. But climate change is already here, and the usual conference scenario — lots of important people talking a lot while getting little done — ain't gonna cut it anymore.

That's why this weekend, hundreds of thousands of people around the world gathered to send a message to their leaders:

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