Happy Birthday, Sir Isaac Newton!


[intro] Today we’re celebrating a birthday! [Squeaks squeaks.] Oh, don’t worry, Squeaks! It’s not my birthday. It’s Sir Isaac Newton’s birthday. Sir Isaac Newton was a famous scientist who
lived a long time ago. He was especially interested in how things
move, even really big things like planets! He was also a famous mathematician. A mathematician is a person who uses math
to tackle big questions about the world. Newton was born in England almost 400 years
ago. He made lots of important discoveries about
the world, including figuring out that light is actually made up of all different colors. He also helped invent a whole new type of
math! It’s called calculus, and you can use it
to learn about how things change. Today, lots of people learn it in high school
or college. Newton made some amazing discoveries about
how things move, too — everything from gigantic planets to, say … an apple. Are you ready for a story? Because there’s a kind of funny one about
Newton and an apple. One day, Sir Isaac Newton was at home, sitting
under an apple tree in his family’s garden. But then, an apple fell off the tree. It might have even bopped him right on the
head! And right then and there, Newton started to
come up with one of his most important theories: the theory of gravity. Newton thought to himself: “Why did that
apple fall from the tree? Why didn’t it float up in the air?” We’re all pretty used to that just being
the way things work: when you throw something into the air, it falls down. But the apple got Newton thinking about why
they fall down. And the answer he came up with was a force
called gravity. A force is anything that’s a push or a pull. So if I pull this apple across the table,
I’m putting a force on it. The force of gravity pulls apples, and people,
and just about everything else, toward the ground. It’s why when we jump up in the air – – We come right back down! Gravity is also why the moon goes around the
Earth. That’s right, the same reason why an apple
doesn’t float away is also why the moon doesn’t just float out into space. Of course, the moon isn’t actually a big
apple. But they’re both controlled by the same
thing: gravity. Newton discovered that things that are really
really heavy attract things that aren’t as heavy. Attract means when something pulls something
else towards itself. So because the Earth is incredibly big with
lots of heavy stuff inside it, things like apples, and people, and just about anything
else you can think of, won’t float away because the Earth is pulling them down with
– there’s that special word again – gravity! And since the Earth is heavier than the moon,
the earth pulls the moon towards its center. But the moon doesn’t just crash straight
into the ground! That’s because at the same time as it’s
being pulled toward Earth, it’s also moving sideways. It’s kind of like the moon is trying to
escape, but since the Earth is pulling on it, it swings around and around in a circle
instead. Gravity is also why the Earth goes around
the sun. The sun is /muuuuuch/ heavier than the earth. It’s humongous, and if you could weigh it,
it would weigh a whole lot! So its /gravitational pull/ is a lot stronger. Earth is pulled in and we end up going around
and around the sun. All because of gravity! And Newton figured out all of that when an
apple fell off a tree. The only thing is, although that apple story
is actually pretty famous, and Newton himself used to even tell it… It may not be totally true. But it may not be totally un-true, either! The truth might be… somewhere in between. So we do know that Newton was inspired by
an apple tree, because a person named William Stukeley wrote a long long time ago about
having a conversation with him about it. And in this conversation, Newton mentioned
watching how apples from a tree fell to Earth. But Newton never mentioned the apple hitting
him on the head. That probably just got added to the story
over time as people kept retelling it. We all love the apple story so much that there
are apple trees that grew from that very first apple tree all over the world. There are even special places you can go to
visit these apple trees, in lots of different countries. So did that apple fall from the tree and bonk
Newton on the head? Probably not. But did an apple falling from the tree to
the ground inspire Newton’s theory of gravity. Very possibly! Well, Squeaks, to celebrate Newton, what do
you say we make an apple pie instead of a birthday cake? Maybe we shouldn’t drop it to see if it
falls, though! That would be much messier than just dropping
a regular apple … plus, this way we can actually eat it! Thanks for joining us! If you want to keep learning more about how
our extraordinary world works, hit the subscribe button, and we’ll see you next time here at the fort. [ OUTRO ]

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Comments

  1. Wait, the internet lied to me about Isaac Newton being born on December 25th 1642 instead of January 4th 1643? Not really because they used a different calendar back in Isaac Newton's day called the Julian Calendar rather than the Gregorian calendar used today, so both dates are true.

  2. Could have used a few punchlines like "The apple doesn't fall too far from the tree" or "The apple of my eye" or idk. Just sayimg …Kids could learn something apart from the awesome information you're giving in videos like this one

  3. what is that weird dangle-y thing in the back of your mouth? and what is it used for?

    Thanks SciShow Kids your awesome! ๐Ÿ˜€

  4. I already know why things get up then fall back down cuz they come back down is the Gravity pull's thing's down E.G like I jump I fall down cuz of the gravity pull's me downโœŒ๐Ÿ˜Š๐Ÿ˜ฒ

  5. 1:58 Gravity is a force that pulls a mass toward a larger mass (ex human toward earth because earth has a larger mass than a human)

  6. My son and I are about to do a unit on DNA, the people it took to discover it, how it draw it, build it, do strawberry DNA extractions, etc… and he always loves videos from you guys. If you can do anything about that we'd be grateful! Thank you for all that you do!

  7. Hi my little brother Trippโ€™s wants to know how hale forms please make a video on it he loves your channel bye

  8. Happy Birthday!!!!! ๐ŸŽŠ๐ŸŽ‰๐ŸŽ‡๐ŸŽ†๐ŸŽ‚๐ŸŽ๐ŸŽ๐ŸŽ‚๐ŸŽ†๐ŸŽ‡๐ŸŽ‰๐ŸŽŠ๐ŸŽŠ๐ŸŽ‰๐ŸŽ‡๐ŸŽ†๐ŸŽˆ๐ŸŽ‚๐ŸŽ๐ŸŽ‚๐ŸŽˆ๐ŸŽ†

  9. Hi there i was wondering if you can make a video about the black hole? How is the black hole made? Or what does the black hole do?

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