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The fifth programme explores the alliances formed between the animal and plant worlds. Attenborough dives into Australia's Great Barrier Reef and contrasts the nocturnal feeding of coral, on microscopic creatures, with its daytime diet of algae. Some acacias are protected by ants, which will defend their refuge from any predator. Besides accommodation, the guards are rewarded with nectar and, from certain species, protein for their larvae as well. Fungi feed on plants but can also provide essential nutriment to saplings (Mycorrhiza). The connection is never broken throughout a tree's life and a quarter of the sugars and starches produced in its leaves is channelled back to its fungal partners. Meanwhile, fungi that feed on dead wood leave a hollow trunk, which also benefits the tree. Orchids enjoy a similar affiliation. Lichens are the product of a relationship between fungi and a photosynthetic associate, usually algae. They are extremely slow-growing, and a graveyard is the perfect location to discover their exact longevity. Mistletoe is a hemiparasite that obtains its moisture from a host tree, while using own leaves to manufacture food. Its seeds are deposited on another by the mistletoe tyrannulet, following digestion of the fruit. The dodder (Cuscuta) is also parasitic, generally favouring nettles, and siphons its nourishment through periodic 'plugs' along its stem. The rafflesia has no stem or leaves and only emerges from its host in order to bloom — and it produces the largest single flower: one metre across.

Mysterious lights shine out from the edge of space, brighter than a trillion suns. They had to be the brightest objects we've ever seen in the universe, putting out amounts of energy that we couldn't possibly explain. So powerful, they can incinerate planets and rip stars to pieces. These are among the most mysterious and most energetic phenomenon in the universe. They can destroy galaxies, but may also be the key to their survival. These objects are a hotbed of all kinds of crazy physics. These celestial powerhouses are called quasars, and we may owe them our very existence.

Nathan Fielder returns with a daring new season that elevates the concept of constructed reality to extraordinary extremes. This season dives even deeper into ethically charged scenarios, where real people rehearse life-altering choices inside meticulously engineered simulations. As the line between performance and authenticity dissolves, the series confronts our deepest questions about control, identity, and the limits of preparation. Disturbing, brilliant, and darkly hilarious—it’s an experience like no other.
The opening three episodes raise the stakes immediately. A father struggles to reveal a devastating truth to his son—but the rehearsal begins to unravel his own sense of self. A woman prepares for a proposal that may never arrive, as emotional tension distorts her reality. And in a startling turn, Fielder inserts himself into the most personal rehearsal yet, facing consequences he may no longer be able to manage. With emotional weight, narrative twists, and biting satire, these episodes pull you in and don’t let go.

Eugene Levy, a celebrated actor and self-confessed travel skeptic forces himself into the discomfort of jetting across the globe, visiting dazzling destinations he would normally avoid. With his trademark wit and unease, he peels back the gloss of travel, dipping toes into local customs, natural wonders, and cultural rituals, transforming each journey into a quietly emotional reckoning with what it means to explore, to connect, and to grow.
In episodes 1 through 4, the adventure starts in the Arctic north of Finland, where he tries ice fishing, feeds reindeer, rides in a husky sled and chases the aurora borealis. Then he plunges into the Costa Rican jungle, sleeping high among trees and confronting wild creatures. In Venice he lounges at a historic palazzo, bonds with a gondolier and reflects on his life and family. Finally, a helicopter drops him into the stark desert at Amangiri in Utah, where he absorbs breathtaking landscapes and engages with the Navajo Nation while battling his own nerves.

An apocryphal view on the pyramids, starting in awe at the amazing achievement of the Pharaonic architecture and sculpture, most specially at Gizeh, given Cheops's pyramid's size, weight, incredibly precise carving, four pairs of slightly shifted half sides, stunningly precisely measured shapes and symmetry. Then it questions and challenges conventional Egyptology beliefs, which it calls unproven or even impossible to verify, such as the absence of machines, a wharf duration of only 20 years or accidental equinox-orientation. Next it elaborates the theory that other major pyramid technology sites in Precolombian America, Easter Island and China can't coincidentally lie on two lines intersecting at Gizeh, even if not contemporaneous and without known contacts in their ages, and have several improbable things in common, like some of their cultures. Elaborate mathematical theories and measurements indicate the Egyptians must have known some astronomy, pi and the golden number

They are the most powerful objects in the universe. Nothing, not even light, can escape the gravitational pull of a black hole. Astronomers now think there are billions of them out in the cosmos, swallowing up planets, even entire stars in violent feeding frenzies. New theoretical research into the twisted reality of black holes suggests that three-dimensional space could be an illusion. That reality actually takes place on a two-dimensional hologram at the edge of the universe.