Dr Helen Czerski examines the hottest natural phenomena on the planet - lightning. Bolts of lightning five times hotter than the surface of the sun strike our planet over 3 million times every day - and yet we still know little about this deadly force of nature. Now, specialist photography is revealing how lightning travels through the air, high-speed cameras are unlocking the secrets of upward lightning that's triggered by our urban landscapes, and scientific expeditions are capturing rare images of intense electrical discharges over 80 kilometres wide.
Part two of two. Explorer Benedict Allen is determined to get disabled journalist Frank Gardner into the wilds of Papua New Guinea, despite having to grapple with Frank's wheelchair. As the terrain gets even tougher to negotiate, the pair know they must make an epic journey into the highlands, crossing through two tribal territories to achieve their objective. However, as Frank gets close to realising his dream of seeing wild birds of paradise up-close, his old injuries return to haunt him and the expedition hangs on a knife edge.
58m • 2017 • Birds of Paradise: The Ultimate Quest
When you picture the lowest levels of the food chain, you might imagine herbivores happily munching on lush, living green plants. But this idyllic image leaves out a huge (and slightly less appetizing) source of nourishment: dead stuff. John C. Moore details the "brown food chain," explaining how such unlikely delicacies as pond scum and animal poop contribute enormous amounts of energy to our ecosystems.
3m • TED-Ed
Southern Thailand is the Thailand we think we all know. It is a place of both spectacular natural beauty and of wild parties, but behind this well-known image is also a place of unexpected surprise, where spirituality pervades every bit of life. For the animals that live here, this is natural wonderland.
59m • 2017 • Thailand: Earth's Tropical Paradise
Wildlife cameraman Vianet Djenguet returns to his beloved Congo to explore the extraordinary wildlife of this remarkable country. Far from being the dark heart of Africa, Vianet reveals a vibrant, wonderful place full of surprising landscapes, incredible people and amazing animals. Vianet takes us from dramatic coasts to pristine rainforest on a wildlife voyage of discovery, meeting inquisitive baby chimpanzees, majestic forest elephants and elusive lowland gorillas. Seen through the eyes of one of its proudest sons, Vianet offer us a unique insight into his homeland.
59m • 2016
In a revelatory look at Svalbard, the most northerly region in the series, Steve Backshall leaves no stone unturned as he unravels the secrets that lie covered in ice for most of each year. Svalbard is cold, dark and foreboding, yet it is home to the world's largest land predator and the most northerly population of large herbivore, but Steve discovers that the real secret to this place comes from a very different world.
28m • 2012 • Nature's Microworlds
Helen reveals the latest scientific insights into icebergs. From side-scanning sonar that scrutinises the edge of glaciers where icebergs are born, to satellite images that show how icebergs create hotspots for life and eyewitness pictures that give us a unique glimpse of how they transform over time, we can now capture on camera the mysteries of icebergs - and how their lifecycle is intricately linked to our changing planet.
29m • 2016 • Dangerous Earth