Nina investigates how space rockets work with the help of Belle, her hearing neuron. Explorers Hamnah and Sulaiman visit Nina in her workshop and discover that space rockets push gas out the bottom which makes them go up, into the sky. Next they visit the National Space Centre in Leicester to see some rockets, before they launch their very own space rocket!

Nina investigates what the Grand Canyon is with the help of Luke, her sight neuron. Explorers Ronnie and William visit Nina in her workshop and discover that the Grand Canyon is a really, really big place in America that has a river running through it. Next they visit the Grand Canyon and see for themselves just how big it is.

Nina investigates how sand dunes are made with the help of Felix, her touch neuron. Explorers Jamila, Johanna and Mae visit Nina in her workshop and discover that sand dunes are made by the wind. Next, they visit Portrush in Northern Ireland to see a really big sand dune for themselves and they learn that sand dunes move backwards very slowly. Lastly, they find out that plants on the top of the sand dune stop the sand dune from moving.

Nina investigates how we can live in space with the help of Bud, her taste neuron. Explorers Evie and Flynn visit Nina in her workshop and discover that astronauts eat special dry food in space. Next, they visit a space centre in Belgium and back in Nina's workshop, they meet an astronaut who has been to space three times.

Explorers Kaiden and Tyler visit Nina in her workshop and, with the help of Luke, her sight neuron, discover that the Earth is covered in big plates of rock that move around very slowly, sometimes pushing together and squashing up to make mountains. Then they visit Beinn Eighe mountain in the Scottish Highlands and take a closer look on a helicopter ride.

Nina investigates what volcanoes are - with the help of Luke, her sight neuron and Belle, her hearing neuron. Explorers Lily and Rebekah visit Nina in her workshop and discover that volcanoes erupt and hot, red liquid called lava comes out and makes the volcano a cone shape. Next they visit a metal works and see very, very hot metal which looks just like lava. Last, they make their own volcano and find out that lava pushes up out of the volcano because it has bubbles in it that are trying to get out.

Nina investigates how the Giant's Causeway was made - with the help of her touch neuron Felix. Explorers Adam, Blane and Zach visit Nina in her workshop and discover that the Giant's Causeway is a place with very special rocks in Northern Ireland. They visit it and find out that hot rock cooled down slowly and cracked into special shapes to make it.

Nina investigates what planets are near us in space - with the help of Luke, her sight neuron. Explorers Dylan and Ewan visit Nina in her workshop and discover how many planets are in the solar system. Next they visit Tenby beach in Wales where they find out how far apart the planets are. Lastly they learn about how the planets move around the sun in an orbit, pretending to be planets themselves.

Nina investigates why rivers are wiggly - with the help of Belle, her hearing neuron and Felix, her touch neuron. Explorers Amelia, Patrick and Radiyya visit Nina in her workshop and discover that rivers move rocks and sand. Next, they have a go on a river rapids ride and find out that water moves fast and slow at different places. Lastly, they find out that the fast and slow water is what makes a river change shape and makes it wiggle.

Nina investigates how people find out about other planets - with the help of all her sense neurons. Explorers Nomi and Oliver visit Nina in her workshop and discover that we can send remote control vehicles to other planets. Next they visit a Mars Rover and they find out why it has to be able to see for itself when it's way up on Mars.

Nina investigates how cliffs were made - with the help of her sight neuron, Luke, and her hearing neuron, Belle. Explorers Ben, Olivia and Sonny visit Nina in her workshop and discover that some cliffs are made from chalk, and chalk is made from crushed sea shells. Next they visit the Needles on the Isle of Wight to see how waves have worn away the rock to make big cliffs.

With the help of Luke, her sight neuron, Nina investigates why we have night and day. Explorers Logan and Sophie visit Nina in her workshop and discover that the sun looks like it moves across the sky during the day. Next they have a ride on a fairground carousel and learn that it is we that move, not the sun. Lastly they find out that the Earth tilts and that is why we have seasons.

Nina investigates how we know about dinosaurs - with the help of Luke, her sight neuron and Felix, her touch neuron. Explorers Jonathan, Max and Sian visit Nina in her workshop and discover that when dinosaurs died some of them became rocks which we call fossils. Next they visit a beach and see fossils for themselves. Lastly they visit a dinosaur park and find out what we can learn from dinosaur footprints.

Nina investigates why we live on planet Earth - with the help of Felix, her touch neuron. Explorers Hannah, Maha and Matthew visit Nina in her workshop and discover that we can live on Earth because it has lots of food and water for us and it's not too hot or too cold. The planet Mars is really, really windy so next they stand in front of a big wind fan to see what it would be like to live on Mars.

Nina investigates why some rocks are stripy - with the help of Luke, her sight neuron. Explorers Alfie, Christy and Lilyanne visit Nina in her workshop and discover that some rocks are different colours because they have something called minerals in them. Next they visit Alum Bay in the Isle of Wight and see big stripy rocks. Lastly they find out that the rocks were made in layers.

Nina investigates what a geyser is - with the help of Ollie, her smell neuron. Explorers Alex and Michael visit Nina in her workshop and discover that geysers are big shoots of water that come up out of the ground. They visit a really famous geyser - Old Faithful in Yellowstone Park, America - and they find out that trapped steam is what makes the water shoot out.

Nina investigates whether Loch Ness has always looked the same - with the help of Felix, her touch neuron. Explorers Caela, Cara and Max visit Nina in her workshop and discover that Loch Ness used to be completely covered in a massive lump of ice called a glacier. Next they visit Loch Ness and see the scratches and lumps of rock the huge glacier left behind.

Nina investigates why the moon is sometimes a different shape - with the help of Luke, her sight neuron. Explorers Hannah, Oliver and Reiann visit Nina in her workshop and discover that light from the sun only shines on one side of the moon. Next they visit Paisley Observatory and see the moon for themselves. Lastly they find out that the moon moves around us and that's why we see different shapes at different times.

Nina investigates how caves were made - with the help of Belle, her hearing neuron. Explorers Joshua, Parisa and Raymond visit Nina in her workshop and discover that water can dissolve things. Next they go to a really big cave where they see different types of rock and they make their own cave by dissolving sugar.

Nina investigates what shooting stars are - with the help of Luke, her sight neuron. Explorers Amy, Jack and Leon visit Nina in her workshop and discover that shooting stars aren't stars at all, they're meteors. Next they visit a dark sky park and see shooting stars in a planetarium. Lastly they find out that when shooting stars land they make craters, like the ones visible on the moon.

Nina investigates how coal was made - with the help of Ollie, her smell neuron. Explorers Cameron, Jaydan and Mia visit Nina in her workshop and discover that coal is a rock which is made from old trees and plants from many, many years ago. Next they visit a real coal mine to see how coal is collected from underground and how scientists know where the coal is.

Nina investigates how we know the Earth is round - with the help of Luke, her sight neuron. Explorers Charlie, Katie and Zack visit Nina in her workshop and discover that even though the Earth looks flat it's actually curved. Next they release a really big balloon that goes way up into the sky to show that the Earth is round. Lastly they travel around Nina's big inflatable Earth and find out that if you go all the way round in the same direction, you come back to where you started from.

Nina investigates what deserts are - with the help of Felix, her touch neuron. Explorers Abbie and Luca visit Nina in her workshop and discover that deserts are really hot, dry places. Next they visit Death Valley in America and see how the heat has dried up all the water and they learn that the sun makes the ground warm, but when it's night time deserts are very cold.

Nina investigates why astronauts float in space - with the help of Felix, her touch neuron. Explorers Marty and Phalgun visit Nina in her workshop and discover that gravity is what keeps our feet on the ground. Further away from Earth, way up in space gravity isn't as strong and so things float. Then they have a go at indoor skydiving and feel what it's like to float.

Nina investigates how waterfalls were made - with the help of Belle, her hearing neuron. Explorers Maya and Ollie visit Nina in her workshop and discover that waterfalls are made from layers of hard and soft rock. Next they visit a waterfall in Wales and find out that it was made because the soft rock wears away quicker than hard rock.