There's an ancient war that's been going on for millions of years. It's a never-ending quest to keep invisible invaders at bay, and you are one of it's battle-hardened heroes! Join us this week for the first part of our tour around the fantastic human immune system, where we'll discover why a hot battle is a good battle.

In this stellar episode our two hosts try to take the confusion out of nuclear fusion. It makes the stars shine, but what is it, and why are governments around the world trying to tame it? Along the way we'll discover that the holy grail of limitless energy may indeed be a donut!

Joe and Senan come back in from the cold to discover what causes our weather in this episode. Yes in part 2 of our delve into the mysteries of the atmosphere, we'll be talking about wind, rain, lightning, greenhouse gases and the joys of living in a permanently soggy climate, where every day is a soft day.

The air we breathe. We can't see it, we can't feel it, but luckily it's always there, like warm blanket protecting us. Join us for part one of our glide through the mysteries of Earth's atmosphere. There's definitely something in it...

It's time for time! On this week's show we explore all the different ways that animals, plants and the human brain keep track of time, and make sure that things happen when they ought to. And we'll discover how salmon might even be masters of quantum physics.

Halloween will soon be here, so what better time to talk about dark monsters. The real ones! Yes it's time for our plunge into the depths of Black Holes. Along the way we'll find out that the scariest things in the universe can even make spaghetti. But the main ingredient is YOU!

Find out what happened when your two hosts took a deep dive into slime and goo. There's sticky, stringy gloop all over this episode. It even got tangled in Issac Newton's wig, as he fired up nature's slime cannon.

Welcome to Season 2! Joe's been up all night worrying about the end of the universe, and wondering where all the energy is going to end up. Senan's attempts to explain what energy is all about, fail to reassure him the slightest little bit. And now he's worrying about cats too...