Our detectives have discovered the human energy source: "food". Now they have to figure out if it has any connection to strangers using their portaloo to dump their disgusting organic waste.
Our duo is investigating the human phenomenon of "friendship". When did friendship start? How do humans and animals become friends? And will our detectives become best friends along the way?
Swiping, pressing, calling, texting - our detectives are dialing in all the facts about smartphones. How do voice assistants work? How do touchscreens work? How do texts get sent? That's all coming up.
It's all about buildings as our investigators examine the famous man-made structures across the Earth. From materials to techniques to jobs to animal homes - they're building a case from the ground up.
Our detectives are taking a close look at human eyes today. How do they work? How do they see colour? How do animal eyes work? Don't blink or you'll miss this eye-opening investigation.
Fashion is in-focus for our detectives today as they examine the human obsession with clothes. From design to trends to colours to function, every stitch is going under the microscope in this stylish investigation.
Our detectives are fearlessly investigating the human phenomenon of fear. Why do humans get scared? What are the most unusual phobias? What's happening in the body when we're scared?
How humans greet each other is the focus of today's investigation. When was "hello" invented? Do animals greet each other the same way humans do? And why do bad greetings make us feel awkward?
Our detectives have noticed that not all humans are the same size. But why? In today's investigation, Major Letdown and Private Groupchat are examining all the different ways that humans grow.
Human hair is a puzzling phenomenon for our detectives. What determines its colour? Its length? And its appearance on certain humans' faces? From root to tip, our investigators are getting all the facts.
Blinking, sneezing, sweating, shivering, yawning, farting - our detectives need to know why human bodies keep doing this. So today's investigation is putting bodily functions under the microscope.
Why don't humans live in nests? Or hives? Or burrows? Today our detectives are examining human homes, who builds them, how they're different around the world and why they've evolved to what they are today.
Our detectives have noticed that humans are always going to their "jobs". But why? When did jobs start? How have jobs changed? And what animals have jobs? A hard-working investigation is about to commence.
Human language is a complex and varied phenomenon. But why? Wouldn't it be easier if Earth had one universal language? Today our detectives are getting to the bottom of it as they investigate language.
How does singing actually work? When did humans first start playing music? What happens in your brain when you practice an instrument? Our detectives are out to find all the answers in today's investigation.
Our detectives have noticed that humans are friends with certain animals. But why? When did humans first begin having pets? And why are some animals better pets than others? That's all coming up.
It's all about photography today, as our detectives find out how a camera actually works. How humans captured moments before cameras. And why humans take so many photos of their food.
Our detectives have noticed that humans have a lot of rules. But why? Who makes these rules? What happens if you break these rules? And how do rules change? The ultimate investigation into rules is on.
Why is there so much water on Earth? Why are humans always drinking it? Why haven't humans run out of water? It's a wet and wild adventure as our detectives are saturated with facts about water.
Fame. It seems like humans are obsessed with it. But why? When did humans decide they wanted to be famous? How does it feel to be famous? How do you become famous? Our detectives are getting all the answers today.
Why do humans spend so much time looking at art? How do you create art? What makes some art better than other art? In an artful investigation, our detectives are getting all the answers on art.
Smiling is something that all humans do. But why? What does it mean? Do animal smiles mean the same as human smiles? And why do humans laugh? Our detectives are getting all the pearly white facts.
Tides, waves, dunes, sand - our detectives are hitting the beach today to find out when humans first start going to the beach, how beaches are formed and what creatures live at the beach.
Our detectives have noticed that humans sometimes get sick. But why? What makes them sick? And why does the body react the way it does? It's an infectious investigation to diagnose the truth today.
Every day, humans fall into some kind of hibernation state. But why? What is sleeping? What do dreams mean? And do animals sleep the same way humans do? Our detectives are getting all the facts.
Major Letdown and Private Groupchat want to know about sport. Why do humans play it? When did it start? Do animals play sport? What are the strangest sports? All the answers and more will come out.
Our detectives have discovered something called a "toilet". But what is it for? When was it invented? Where does the toilet take everything? And do animals use toilets? The truth will be revealed.
Travel. It's something humans do every day. But why? When did humans start travelling? How do planes work? How did they get around before planes? All will be revealed as our detectives investigate.
Our detectives have noticed the humans doing something called "dancing". But why? When did this activity start? Are humans the only creatures that dance? It's a toe-tapping investigation to find the truth.
Humans have so many devices and machines. But how are they powered? When were these energy sources discovered? How do humans generate energy for themselves? It's a power-struggle to get the answers in today's investigation.
Our detectives are hitting the classroom as they learn the hard lessons about school. Why does it exist? When did it start? How has it changed? It's a textbook investigation worthy of a gold-star.
Our detectives have noticed that the Earth isn't flat. But why? How are mountains formed? Have the continents always been in the same place? The topography of Earth is under the microscope in today's investigation.
Stories. Humans are fascinated by them. But why? When did storytelling start? What makes a good story? How has storytelling changed? It's a juicy plot as our detectives negotiate the twists and turns to earn a triumphant ending.
It's a chilling investigation as our detectives try to figure out why certain things on Earth are cold. Why does winter happen? How do animals survive extreme cold? And what sports are played in the cold?
Our detectives have noticed that sometimes humans get injured. But how? What happens in the body when you're injured? How does the body heal itself? And how did humans deal with injuries before modern medicine?
Why do humans celebrate birthdays? And New Years? And anniversaries? Today, Major Letdown and Private Groupchat are finding out all about events and what makes humans such a festive bunch.
Why is the Earth all different colours? How do humans make colours? Do animals see the same colours as humans? It's a colourful investigation as Major Letdown and Private Groupchat get the facts about colours.
Currents, tides, waves and marine life are all under the microscope as Major Letdown and Private Groupchat explore the depths as they seek to discover what on Earth is going on under the sea.
Our detectives have noticed that humans are sending rockets into space. But why? What have humans discovered up there so far? And what are their plans for the future? All will be revealed in this galactic investigation.
Our detectives can't help wondering why Earth has been split up into different countries. Why are there so many? Who decided where the borders are? How do you travel between them? It's all coming up.
Humans seem to be obsessed with time. But how does time work? Why is it different times in different places on Earth? And how did humans keep track of time before they invented clocks?
Our detectives have noticed that certain things on Earth are hot. But why? How do animals and plants survive in extreme heat? Why do chillies taste hot? And how does heat change the structure of food?
Money is the focus of today's investigation as our detectives try to figure out when humans started using money, what money is actually made of and why money is different all over the world.
It's a rubbish investigation today as our detectives examine what humans throw out. How much rubbish do humans generate each year? Where does it go? How can it be recycled? And how do you make compost?
Our detectives have noticed that humans don't know everything. So today they're examining the biggest mysteries on Earth. From UFOs to de ja vu to magic to aliens - it's all going under the microscope.
Our detectives have noticed that humans are all encased in something called "skin". But what is it? How does it function? Why does it get itchy? And sunburnt? And pimply? All their questions will be answered.
Fitness is the focus of today's investigation as our detectives examine the human obsession with being in shape. When did it start? How does it work? And what actually happens in the body when you exercise?
Our detectives have noticed very small humans known as "babies". But what are they? What's going through their heads? Why are they so small? And how do they develop into big humans? That's all coming up.
The Earth is covered with plants. But why? How did plants spread around the world? How do they grow? And why can humans only eat some plants? All the answers will be revealed.
Make-up and jewellery are the focus of today's investigation. Why do humans wear them? When did it start? How is jewellery actually made? And how has make-up changed through the years? The truth will be revealed.