15 scientific breakthroughs from 2015 that made our world a little better.

From rhino cameras to tiny molecules to space explorations, these 15 scientific discoveries were pretty earth-shattering.

In 2015, science helped us learn a lot about the universe we’re living in.

From the tiniest molecules making up the building blocks of matter to gigantic planetary systems billions of light years away, we witnessed countless scientific discoveries, advancements, and inventions this year.

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Say hello to Neil DeGrasse Tyson, king of science.

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15 times politicians did the right thing in 2015.

You may not always agree with these politicians, but let's give credit where credit is due.

2015 has been a big year in a lot of ways.

The Supreme Court ruled on marriage equality and upheld the Affordable Care Act. The people of Ireland became the first country to grant the right to same-sex marriage by popular vote. There have been lots of good political things happening behind the scenes, but how about a few examples of positive things politicians did throughout the year?

1. World leaders came together and signed on to a historic climate change agreement.

Earlier in December, world leaders met in Paris to address an issue vital to the Earth's survival: climate change. And for once, the politicians in attendance got real about the need and urgency to take immediate action.

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2015 was an intense year.

Some pretty amazing things happened. The Supreme Court legalized same sex marriage, we made incredible progress in space exploration, and yet another country eradicated polio.

But we faced some seriously difficult times, too. There were many mass shootings in the U.S., Paris suffered a terrible terrorist attack, and all around the world, girls as young as 8 years old were still being forced to marry. And like every year, 2015 was another that saw ongoing problems, like homelessness and hunger.

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