Science and the Internet are two individual entities that, when combined, become the 21stcenturys most powerful educational tool. If you suddenly feel the urge to know why theres a supermassive black hole at the center of every galaxy, or if youre just wondering why you cant tickle yourself, you can find out in under a minute using just your smartphone.

If youre looking for more thanjust a brief overview, why not take a look at these online courses by edX? These entirely free lecture series give you a rigorous, entertaining, university-level understanding of a whole bunch of cool scientific subjects.So if youve got a thirst for science, one of these courses will certainly quench it.

1 Human Anatomy

Explore the human bodyviasix healthcare professional perspectives.Kjpargeter/Shutterstock

Ever wondered what happens to the human body during a stroke? As the fifth leading cause of death in the United States, more than 125,000 people die each year from the condition. To learn more about thehuman body,dissect the anatomy of a stroke through role play videos and lectures given by visiting professors.

2 From Goddard to Apollo: The History of Rockets, Part 1

Andrey Armyagov/Shutterstock

We all know the astronauts who have walked on the moon, but what about the fathers of modern rocketry? How did a budding rocket genius attract the attention of the German military? If youve wanted to know all the ins and outs of rocket science, then sign up for this course.

3 Greatest Unsolved Mysteries of the Universe

A composite image of the center of the Milky Way. NASA/JPL-Caltech/ESA/CXC/STScl

Every time theres a huge discovery in astrophysics and astronomy, our place in the universe is put into perspective. Still, theres much we dont know, and the universe is notoriously uncooperative when it comes to revealing its deepest, darkest secrets. What initiated the Big Bang? Can a universe really appear from nothing? Where are the first stars? Is there life out there? Get a grasp on the unknown with this course.

4 Introduction to Computer Science

AlphaGo is now the reigning Go champion. Getty Images

Learning a second language has extremely positive effects on your brain, while at the very least allowing you to ask for alcohol in far-flung lands. Computing already has plenty of languages, and with the global proliferation in Internet-connected technology, it wont be long before computer languages will be seen as just as important as speaking Spanish or Mandarin. Sign up and get ahead of the game.

5 The Science of Happiness

If all else fails, find a cute puppy or kitten. fivepointsix/Shutterstock

Everyone endeavors to be happy, but its actually fairly difficult to define what happiness is. With the help of psychologists, delve into the course to find out why our social connections and contributions to something grander than just ourselves are the keys to a long-lasting grin.

6 Astrophysics: Exploring Exoplanets

Welcome to hell in deep space. sdecoret/Shutterstock

The cosmos is a peculiar place, and hiding out there are distant worlds with utterly bonkers behaviors. Superheated gas giants skim past stars as if they were comets; entire magma ocean worlds are slowly being obliterated by powerful stars; some are made entirely of diamonds. Explore the frontiers of space with this course.

7 Making Sense of Climate Science Denial

Bye bye, Antarctic ice hello, sea level rise. Armin Rose/Shutterstock

Climate change is the greatest problem facing humanity today if we leave it to continue unabated, it will make everything thats bad worse. Despite the fact that its near-universally accepted by the scientific community, campaigns of misinformation will try to convince you that its all one big conspiracy. Arm yourself with all you need to know by taking this course.

8 College Algebra and Problem Solving

I don’t get it.

If you have ever needed a refresher on college level Algebra, this is your chance. In this self-paced course, youll learn all about linear and quadratic functions, general polynomial functions, rational functions, and more. Get that math brain at the ready and apply your algebraic reasoning skills here.

9 The Chemistry of Life

What is required for life to begin? Gio.tto/Shutterstock

How does chemistry turn into biology? is one of the greatest unsolved questions of science. Answering it will reveal the origins of life on Earth, and perhaps elsewhere in the Solar System and beyond. This course will help you understand how far along scientists have come on this monumental quest.

10 Introduction to Animal Behavior

Whats the social life of chimpanzees like? Jeannette Katzir Photog/Shutterstock

Humans are animals, and so understanding the animal kingdom is really a way of understanding ourplace in it. Can animals learn, communicate, empathize or even plot mischief? What drives animal warfare and cooperation? Is it just primates that have social structures, or do birds, sea creatures, and insects also have them? Find outright here.

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