Most planets we know of are so hellish, it seems impossible that anything could live. But it's amazing where life can take hold in the Earth. Astrobiologists look for simple single-celled microbes known as extremophiles in places as Danakil Depression, known in Ethiopia as 'The Gateway to Hell.'
In Episode 2, the fictional world is Janus, a planet in such a close orbit than its rotation is locked by the star's gravity and it always shows the same face to its sun. On one side of the planet, it's always daytime, a searing desert. On the other side, it's forever night, a frozen shadowland. Squeezed between the two, a sliver of perpetual twilight. Freezing meltwater flows from the cold side, carving canyons through the landscape. Deep in these canyons lives an extraordinary five-legged creature.

(Click CC for subtitles) Descending to remarkable depths below the sea on one single breath, Alessia Zecchini enters what she describes as the last quiet place on Earth. The Italian champion is determined to set a new world record in freediving, a dangerous extreme sport in which competitors attempt to reach the greatest depth without the use of scuba gear. Freedivers are often subject to blackouts upon ascent, necessitating the help of safety divers like Stephen Keenan, a free-spirited Irish adventurer who fell in love with the sport in Dahab, Egypt.
Having formed a special bond on the freediving circuit, Alessia and Stephen train together to make an attempt on Dahab’s legendary Blue Hole and its challenging 85-foot-long tunnel 184 feet below the Red Sea, their fates inextricably bound together.

Will explore the strategy, deception and feats of engineering plants use to thrive in the changing weather of different seasons. In the face of conditions ranging from ice and snow to raging fires, survival is often a question of perfect timing - particularly when contending with intense competition and surprising predators.
In this episode, David Attenborough travels to Finland to show one of the most extreme examples of seasonal plant life in the Arctic Circle. He also travels to California to see how climate change is affecting giant sequoias. These ancient trees like all other seasonal plants depend on the predictability of the seasons and our current changing climate threatens their survival.

The meteoric rise of renewable energy has consequences for our electricity supply. While coal and gas fired power stations can generate electricity whenever you need it, renewables are intermittent by nature. So we need a backup plan for when the wind stops or the sun goes down.
All over the world, engineers and scientists are racing to solve one key problem; how to safely and efficiently store electricity at a huge scale but at a low cost. The quest is producing some truly remarkable ideas and this episode details three of them.

In 1949, after decades of making wooden furniture and toys, Ole Kirk Christiansen's small factory in Billund, Denmark, moved to plastic and created the 'Automatic Binding Bricks', which would later be known as LEGO. When the company patented the tube system in 1958, LEGO became the dominant toy line worldwide throughout the 1960s and 1970s. When other competitors capitalized on the expiration of the company's patents in the 1980s, LEGO faced stiff competition until they reported their first loss in 1998. Poor business decisions with film licenses and the failure of the Jack Stone and Galidor lines brought LEGO to near-bankruptcy until Jørgen Vig Knudstorp took over the company and, by bringing it back to its roots, rejuvenated LEGO's profits.
By the time The Lego Movie hit theaters in 2014, LEGO became the largest toy franchise in the world.

Now, the most famous woman to graduate college finds her voice, but when she tries to use it, a toxic culture that perpetuates misogyny will do anything to shut her up. Brooke Shields talked about her life and career. There was a time when she was a household name, a cultural phenomenon. Shields didn’t need much of an introduction. Most often, her starring role in the 1980s film 'Blue Lagoon' or her Calvin Klein ads are enough.