If a hotel with an infinite number of rooms has an infinite number of guests, how could it free up space when new guests arrive? Hilbert's “Grand Hotel” paradox has fascinated mathematicians, physicists, philosophers, and theologians, as it encourages another way of thinking about the notion of infinity.

On the most fundamental level thinkable, what are things? Why are things? And why do things behave the way they do? Here is an introduction to particle physics, with all of the vocabulary you'll need.

Bilbo Baggins the Hobbit was just minding his own business when Gandalf the Wizard drops in. One by one, a whole group of dwarves drop in, and before he knows it, Bilbo has joined their quest to reclaim their kingdom, taken from them by an evil dragon named Smaug.

John Searle's thought experiment, called "The Chinese Room," presents an argument against the idea that computers could ever be truly intelligent.

The Tom and Jerry cartoon has been a classic since it first came out in 1940. America's favorite rivals now take their cat-and-mouse game to the big screen – coming to theaters in 2021.

The more you think about it, the more complex time travel seems! This video explains a key paradox that is one of the main reasons for this.

The English language has changed in many ways over the centuries, but the internet has changed it in just a few decades. Why use a whole sentence when an abbreviation will do?

Groovy is in a festive mood with the holiday song "We Wish You a Merry Christmas." It's a classic song for Christmas in the US and UK.

Fred Flintstone and his best friend Barney Rubble like to go bowling and play golf, but before they can relax and enjoy themselves, there are household chores to be done. Fortunately for them and their wives, Wilma and Betty, there have already been some fantastic new inventions to make Stone Age living that much easier.

Bedrock, home of the famous cartoon caveman Fred Flintstone, is a very modern Stone Age city. There are newspapers, cars, televisions and telephones, even a system of airmail!

A scene from Peter Griffin’s past life as Griffin Peterson: He and his friends win over the audience at the local talent show with a song that rips off 1984’s wildly successful comedy “Revenge of the Nerds.”

The witch surprises the prince and he falls from the tower. Fortunate to have survived but blinded, he wanders the forest, living on wild plants and fruits, until one day he arrives at the desert where Rapunzel was banished, and hears her voice once more…

Enchanted by Rapunzel’s singing, the prince climbs the tower to meet her. They make plans to escape together, so they can be married and live happily ever after. But when the wicked witch learns of the prince’s visits, she flies into a vengeful rage.

In this well-known and well-loved loved fairy tale, Rapunzel’s poor parents are forced to give her away as a baby to a wicked witch. When the child grows into a beautiful young woman, the witch hides her away in a tall tower in the woods. Will she ever be rescued from her lonely fate?

Somehow the team needs to get the control baton away from Doctor Spooky, before the whole environment is trashed! How about distracting him by appealing to his vanity?

How can one brother travel into space and return younger than his twin? In just sixty seconds, a startling side effect of Einstein’s Theory of Relativity is explained to us.

Peter has a surprise for Lois, but not the kind she would necessarily hope for.

No sooner have the Superzoo team put the forest back the way it was, and Doctor Spooky is up to his tricks again! What’s his plan this time? To control people’s minds and make them drop litter on the beach!

It looks like Kit will be late for school today, as a lot of strange events seem to be conspiring against him. But the worst is yet to come! When Doctor Spooky’s picnic goes wrong, he sets his robot to destroy the forest.

Someone is creating a thick cloud of smoke that is polluting the planet… It’s evil Doctor Spooky again! The Superzoo team needs a solution fast so that they can thwart his horrible plan!

It’s a warm, sunny day, so what is making everything so cold? It’s Doctor Spooky, operating a giant robot! Can the Superzoo team stop to his plan to freeze the planet?! Catty and Monky jump straight into action.

The catchy tune "Baby Shark" teaches us the names for various family members in English.

In this video, Groovy joins us for two well-known sing-along songs. Do you know the "Finger Family Song" and "The Wheels on the Bus"?

It’s Easter, and Grandpa Pig has hidden lots of chocolate eggs in his garden for Peppa and her friends to find. The hunt is really fun, but will everyone find an egg?