# There's Always More Room at the Quantum Hilbert Hotel

Physicists have created a quantum version of a famous thought experiment: the so-called Hilbert Hotel, which is always full and yet a vacancy can always be found for additional unexpected guests.

Physicists have created a quantum version of a famous thought experiment: the so-called Hilbert Hotel, which is always full and yet a vacancy can always be found for additional unexpected guests.

For years, Marvel put out a *What If?* comic series, pondering alternate realities in the Marvel universe, covering everything from “What If Wolverine was a Vampire?” to “What if Aunt May was a Superhero?”. You know, the *big *questions. But this year, the series is back for a short run, with its eyes on the Mad Titan .

According to the Many Worlds Interpretation of quantum physics, we live in an infinite web of alternate timelines. It's a serious claim that carries some rather serious scientific, philosophical, and existential baggage. And here are the nine weirdest possible implications.

The always-excellent Vi Hart (previously) gives one of the most engaging explanations of multiple infinities we've come across in some time.

Here's a fun little brain wrinkle pinch for all you non-math people out there (that should be everyone in the world*): the sum of all natural numbers, from one to infinity, is not a ridiculously big number like you would expect but actually just -1/12. Yes, the sum of every number from one to infinity is some weird…

Is *True Blood* too... slow-paced for you? Then you should probably pick up Dark Horse’s new series *Kiss Me Satan*, in which a variety of monsters hunt down a witch and her demon bodyguard for a New Orleans mob boss who happens to be a werewolf. But there’s more monsters, melancholy and madness in this week’s comic…

It’s bad news in the Marvel U. this week, as the *Infinity* event begins! Reality is breaking down, half the Avengers are fighting a war in space, and worst of all, Thanos is back! Meanwhile, Wonder Woman comes to Smallville, *Saga* continues and Buck Rogers returns from the 25^{th} century, all in this week’s comic releases!

Our universe appears to be bound by a finite set of laws, yet we often talk about things that go on for an eternity. "Infinity" is a strange idea. But it's crucial if you want to understand anything from philosophy to mathematics. Here’s why.

It's Monday morning and the work week ahead seems infinite. It's not though, and you should be glad because infinity isn't just long, it's also confusing. Take for instance this quartet of infinite paradoxes that will blow your groggy mind.

Mirrors can be for so much more than just gawking at your slack-jawed mug first thing in the morning. They can, for example, be used to give the illusion that towering designs made of light reach out past you, to an indeterminable vanishing point seemingly so distant as to be infinitely far. That second one is what…

It's probably time to fire up that second cup of coffee; the journey that TED-ED lecturer Dennis Wildfogel is about to take you on is one of infinite infinities. In other words, it's going to make your brain hurt. But it also just might make you smarter.

Minute Physics' Henry Reich takes a break from physics to drop some maths knowledge. Using some basic tenets of set theory, Reich explains how we know that one infinity can be bigger than another.

There are probably more theories floating around to explain the birth, life and death of the universe than for any other scientific concept. Some scientists champion the idea of the Big Bang that created everything around us, others postulate that that we live in a steady state universe with no beginning or end. Now,…

Well, it's finally here, Apple's new hotness. But how does it compare to the new hotness from Asus, Samsung, Amazon, BlackBerry, or heck, the iPad 2? We've got you covered with this head-to-head spec sheet.

Asus is on a roll with its rebranded ‘Transformer Pads' tablet line, pushing out yet another version. The Infinity series takes the Prime and runs with it, packing either a Tegra 3 or a Snapdragon S4 and a 10.1-inch full-HD screen.

This problem of infinity was pondered by Georg Cantor. What he concluded started him down a road that wound through infamy, through respectability, and wound up in theology. Find out more than anyone ever cared to consider about the infinite.

Find out about an old paradox dreamed up by mathematicians in the roaring twenties. It takes a simple (and hypothetical) hotel and uses it to peer into the eyes of the infinite.

Macro-meta meets micro-meta here, where an artist in Queens explains how he used a hacked sewing machine to make Cosby sweater that reaches into the infinite. On the sweater Bill Cosby wears the sweater, on which Bill Cosby wears the sweater. And the pattern in the background of the sweater? It's the pattern on Bill…

Infinity. It's an idea too large for our consciousness, and how can you see that which cannot be contemplated? These 30 photos from this week's Shooting Challenge answer that question, giving us the faintest glimpse of the limitless.

The notion of infinity is fundamentally beyond the human ability to comprehend, but that hasn't stopped mathematicians from trying. So just what is infinity, and why is there more than one of them? And just what *is* infinity plus one?