Sultan Mehmed II's siege of Constantinople enters its third week. Mehmed's artillery teams continue their relentless bombardment of Constantinople's walls. After his navy suffers a devastating defeat, Mehmed moves his ships overland to the Golden Horn in a daring, visionary feat. In the shadow of betrayal, Giustiniani attacks the Ottoman fleet.

Episode 7 focuses specifically on first contact and the search for intelligent life in the vastness of the cosmos. Are humans ready to make first contact with other intelligent beings? Is our technology even sophisticated enough to detect communication signals from another world? Who are we to search for alien intelligence when we can't even recognize or respect the consciousness all around us, or even beneath our feet.
Neil deGrasse Tyson reveals the hidden underground network that is a collaboration of four kingdoms of life, and a true first contact story between humans and beings who communicate in a symbolic language and have maintained a representative democracy for many tens of millions of years.

The world’s first flying car might be on the market sooner than we think, and as a new, cutting-edge invention goes through a series of gruelling tests, behind-the-scenes access reveals the secrets of this sci-fi innovation. With the ability to carry up to 250 kg (551 lb) of payload at speeds up to 80 km/h (50 mph), the 12-rotor Seraph is developed by the Bristol-based company aptly named Vertical Aerospace, and is the Britain's leading electric VTOL (vertical take-off and landing) air taxi candidate.

Waldemar Januszczak sets out to uncover the secret meanings hidden in four famous paintings by Van Gogh, Gauguin, Cezanne and Seurat. Everyone knows the pictures. They are among the most celebrated masterpieces of art. And yet, hidden inside them are codes and puzzles that no one has been able to decipher.
Van Gogh’s Self-Portrait with Bandaged Ear was painted soon after he cut off his ear with a razor. But how much do we really know about it? In a far-ranging investigation, Waldemar Januszczak delves into the clues hidden in the painting. The result is a tale of geishas, brothels, bullfights, love affairs, suffering and a fiery relationship with Gauguin. The work has a powerful secret message, if you know what to look for.

Why do we sleep? And what does sleep have to do with memory, trauma, and our emotions? From fruit flies to whales, virtually every animal sleeps. But why? Why do we need to spend nearly a third of our lives in such a defenseless state? Scientists are peering more deeply into the sleeping brain than ever before, discovering just how powerful sleep can be, playing a role in everything from memory retention and emotional regulation to removing waste from our brains. So why are we getting so little of it?

The Vision After the Sermon, also known as Jacob Wrestling with the Angel, is a painting full of symbolism and mystery. But what does Gauguin’s famous work have to do with a 17-year-old girl called Madeleine, with Victor Hugo’s Les Miserables, and with sumo wrestlers?
Waldemar Januszczak reveals all as he investigates Gauguin’s epic religious painting about good and evil, temptation and desire.