# The evolution of mathematics, from agriculture to quantum mechanics | Michelle Thaller

Oğuzhan, you asked, why is mathematics the
universal language? And this is something I’ve actually thought
a lot about. Mathematics is in some ways kind of scary
in how useful it is at really describing how the universe works around us. Now, to give you an idea, the origin of mathematics
seems very straightforward. We can count on our fingers up to 10, and
maybe it was useful to understand how many sheep you had? So you could start counting sheep and then
you either added or subtracted sheep as you got more or as you lost some. It was a simple thing. We learned how to count. We learned how to add and subtract. The idea of multiplying and dividing is a
little more abstract, but that also makes sense. That’s something that we can kind of visualize. But then what amazes me is that this led us
on a tremendously complicated journey that’s still going on to this day. And we had no idea where this would lead us. If you can do multiplication and subtraction,
it’s not too long before you begin to develop the basic building blocks of calculus. And calculus describes how moving objects
can change, how things can accelerate. If you want to describe an apple falling from
a tree to the ground or a ball rolling down a hill, that’s calculus. It’s the mathematics of how things can change
over time. That’s really interesting, and the amazing
thing is it works so well. If you use these equations to predict how
a ball will roll down a hill, reality matches that. It really does tell you how something is going
to behave. So now we’ve gone from counting on our fingers
how many sheep we have to being able to predict what the universe around us is going to do. That’s incredibly powerful. Now we look around us and we see things like
planets orbiting the stars or the galaxy turning around, and we realize those equations of
motion apply to everything else in the universe. It’s not just here. It’s not just on the surface of the Earth,
but we can look at things literally billions of light years out in space, and they’re following
those same rules of mathematics. But now things got strange. We started to play with calculus. We started to see where it would go. What happens if you put in more variables
and you solve for more things at once? And we end up with some very strange abstract
concepts that turned out to be surprisingly useful. One of the things that kind of worries me
is something called imaginary numbers. Imaginary numbers are numbers that don’t really
make sense in our proper definition of mathematics. Take, for example, the square root of negative
1. Now, in mathematics, if you multiply something
by itself it always turns out to be a positive number. That’s never a negative number. But somebody said, what happens if we start
to do the mathematics of how an imaginary number — this can’t be real. The square root of negative 1 doesn’t make
any sense. But it turns out to be able to describe how
things rotate, and that became the foundation of quantum mechanics. And here’s the thing, now when you use a number
that shouldn’t exist — that doesn’t make any sense — it predicts exactly how an atom
will vibrate, It will predict how quantum mechanics at a very small scale runs, and
it needs a type of math that doesn’t make any real sense to us but it works. It works perfectly. So we keep getting led farther and farther
down this rabbit hole. Where does math lead us? Now we realize that you can describe physics
incredibly well if you allow the universe to exist in many different dimensions– more
than three dimensions that we’re familiar with. In fact, specifically, if you want to do particle
physics, it requires 11 dimensions. That’s not something our minds comprehend,
but we can do the math. We can do the math of how things would behave
if they could move in 11 different directions. And it turns out to predict exactly the results
we get from particle physics. That’s kind of scary. Does that mean that’s real? Are there really 11 dimensions? The math works so well, and the predictions
are so strong that it can’t just be nonsense. But now we’ve gone to the limit of what I
can tell you; is it real or not? Our math has given us something incredibly
useful, but it’s taken us completely out of our realm of common sense, of human scale
of how our minds work and even our sense of space and time. I don’t think that journey’s over yet. Where is math going to lead us? It may lead us to understand things like the
universe is a type of a hologram? That was a mathematical solution to How things
work around a black hole, and it works really, really well. So I think it’s wonderful and a little bit
scary that you start counting on your fingers. You get to 11 dimensions of space and time. And where else?