The day has finally arrived. It’s once again time for all of Earth’s mightiest heroes to assemble, this time to battle a sinister artificial intelligence known as Ultron. Thankfully, Whedon struck more gold, and nerds world-wide won’t be disappointed with what is arguably the biggest superhero movie to date.

But like all of our favorite geeky properties, I think there’s always room to go deeper into what we love, with science! Below, I’ve rounded up all the Avengers-themed Because Science videos I’ve done so far. Enjoy!

How Does Thor Fly?

Thor isn’t just the god of thunder…he’s the god of momentum too. Or at least he has to be to fly the way he does — by spinning a variable-weight hammer, Thor can soar wherever he wants:

Why Don’t Tony Stark’s Suits Kill Him?

Arc reactors aside, there’s one aspect of Tony Stark’s amazing collection of suits that stands out: they don’t kill him. Here’s why they should:

How Does Super-Soldier Serum Work?

The first Avenger was also the first person in the Marvel universe to successfully incorporate the infamous super-soldier serum into his system. Here’s how Captain America’s secret sauce might work:

Why is the Hulk Green?

Since I have no idea how Bruce Banner’s pants always stay on, I’m tackling an easier question: Why does Banner turn green? It’s one of my favorite explanations of science fiction because it makes such sense:

When Will We Have Ultron-Level A.I.?

If both Elon Musk and Stephen Hawking are afraid of something, shouldn’t we be too? In this final Avengers video, I look at just how nigh “The Singularity” is:

That’s not all I’ve tried to explain in the Marvel universe. Check out another Because Science on how Daredevil can see without sight, an article on what a Hulkbuster punch might feel like, and hit me up on Twitter @Sci_Phile if you want to engage in totally not pointless debate.