Asteroids are one of the most mysterious objects in our solar system. These oblong balls of rock circle the sun in strange, non-circular orbits and occasionally crash into other planets. One spacecraft had a mission to discover more about asteroids by landing on one, collecting samples and sending those samples back to Earth. Now the question is, what did we learn from these samples?

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Throughout history the tallest mountain in the world has changed a few times. In the 1700s, it was Mt. Chimborazo in Ecuador. And in the 1800s, it was Mt. Dhaulagiri in Nepal. So, why does it keep changing? And can we really be sure that Everest still holds the title?

Here in the U.S., we travel primarily by car or plane. In Europe, trains are an easy, affordable way to travel. But over the last few decades, trains have struggled to compete with airlines. A new bill could change that and make train travel easier and cheaper once again.

The first modern computers were created during World War II to crack secret codes and compute artillery ranges. But you may not know that almost 100 years earlier, a brilliant scientist was developing a mechanical computer that could do many of the same things. Today's tech might be very different if he was able to complete it. So, why didn't he finish?

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