We put our bodies to the test to find out how they react in extreme temperatures.
Andy heads to the Namibian desert in Southern Africa, where he meets a giraffe.
JB and Storm find out about holly, fell ponies, wool and renewable energy.
Rory takes two dogs to donate blood while Ferne checks on some ferrets at a wildlife park.
Hacker T Dog is ready to sum up the coveragefrom Pyeongchang, in his own special way!
We find out what a human brain looks like and how it controls your body.
Andy heads to Brazil and meets a troop of capuchin monkeys who lead him to some honey.
Ferne takes two rats to see the vet. Rory joins a zoo vet on her rounds.
Hacker has been on the lookout for those bits of Winter Olympics coverage.
Jake Mitchell, YouTube sensation, pranks his way into the Music Mansion.
We take a closer look at your tongue and how your taste buds work.
Andy heads to Japan to record a video of a male pufferfish building its nest in the sand.
Ferne meets a vet caring for a goose with a sore foot. Rory joins vets at a wildlife park.
Hacker is back to tell you all you need to know about yesterday at the Winter Olympics.
Andy Torbet is on a quest to match the mighty mako shark. Will he find a way to beat it?
Andy jets off to Africa in his safari-mobile to see how lions in the wild deal with flies.
Ferne meets a vet checking a dog's weight. Rory visits a vet caring for rescued wildlife.
Muscle and tendons work together to make our bodies move - we show you how.
Hacker is back to offer his thoughts on the sporting action in Pyeongchang.
Ruben goes to find out what life would have been like had he been born in Moldova.
Andy heads to America and embarks on an epic adventure with a tiny grasshopper mouse.
Rory meets a pony dentist at a riding stable. Ferne joins a zoo vet checking on a lemur.
Investigating how leeches and maggots are used as a medical treatment.
On a mini-beast hunt, Barry and Kari have to learn from experience to avoid a big puddle!
Find out what it means to be chilly with epic liquid nitrogen experiments.
Ed Petrie and his friends embark on a Vietnamese river adventure.
Ricky's nan has bought him some driving lessons but he is not keen.
Joe and Lauren look back at all the amazing dens built throughout the series.
Barry has many toys but is only willing to give Kari a small pebble to play with.
Hacker takes a fast-paced look back at the Winter Olympic coverage.
Three dogs show us how they can help in medical situations.
Andy heads to Africa to meet some chimpanzees and track down some kapok tree seeds.
Gerald the goat gets a visit from a farm vet. Rory finds out how vets care for otters.
Hacker has been glued to the Winter Olympics and is here to offer his thoughts.
Discovering how your nerves work.
Andy heads to the Arctic to record a video on his gizmo of an Arctic fox hunting.