Each night you look at the sky and see the Moon. But imagine if one day you saw Mars or Saturn where the Moon was supposed to be. Which consequences would it brig to our planet? It would turn the Earth into a different world? wouldn't it? In this video we're gonna explore which planet we can safely replace our Moon with. And which planet replacement would be the most disastrous one?

Who’s the smartest person in the world? You might answer with the name of a famous scientist, inventor or creator. But what if I tell you it's a person you've never even heard of! She has a very high IQ and managed to solve one of the most difficult puzzles in the world. I'm gonna tell you everything about her! Here's an amazing story about Marlyn vos Savant, the smartest person in the world. In 1956 newspapers in all states wrote about a new IQ test record and the most intelligent person. They wrote it belonged to the resident of St. Louis, Missouri who got the highest score... Even Albert Einstein and Isaac Newton had a much lower IQ.

Why does outer space look black? Well, the night sky is so dark to our perception because most of the universe is empty. But have you ever wondered what space would look like if it was red? Just imagine: you go out on the roof at night to look at the stars, but the whole sky is red! What's going on here? This can't be real. Has something happened with the earth's atmosphere? Or maybe you're on another planet entirely!? It seems a super-powerful star has formed near the Earth – it’s the only reasonable answer! Space is usually black because stars are too far away from each other and from our planet. The closest they get is 4 light-years away, and that trip would still take 137,000 years to get from A to B! The light they emit simply can’t illuminate that vast space in between. But it can and does when you shorten the gap.