Most Viewed Keyword Scientific Theory

When her scientist ex-boyfriend discovers a portal to travel through time -- and brings back a 19th-century nobleman named Leopold to prove it -- a skeptical Kate reluctantly takes responsibility for showing Leopold the 21st century. The more time Kate spends with Leopold, the harder she falls for him. But if he doesn't return to his own time, his absence will forever alter history.

A simple, carved figure bought at an auction in New York leads David Attenborough on a global journey from Russia to Australia, from England back to the Pacific. On the way he delves into a history of the stunning stones on Easter Island.

Easter Island has long been the subject of curiosity and speculation. A triangle of volcanic rock in the South Pacific, Easter Island is over 2000 miles away from the nearest population center, making it one of the most isolated spots on Earth. It is best known for the giant stone statues, known as the Moai, that dot the coastline.

A Tear in the Sky takes you on an unprecedented journey into the UAP/UFO phenomenon as we follow a team of world-renowned experts, scientists, and military personnel who will attempt to unravel the UAP/UFO mysteries using state-of-the-art, military-grade equipment, and technology. While the UFO phenomenon has existed since the dawn of recorded history, very little scientific research is accessible to the public. Most of the serious research is conducted by various governments and militaries across the planet; this film is a documentary on how a team of military veterans, scientists, and researchers come together and launch an investigation into this fascinating world of the unknown while providing the data and results to the public.

At the edge of our solar system supposedly lies an immense planet. Five to ten times the size of the Earth. Several international teams of scientists have been competing in a frantic race to detect it, in uncharted territories, far beyond Neptune. The recent discovery of several dwarf planets, with intriguing trajectories, have put astronomers on the trail of this mysterious planet. Why is this enigmatic planet so difficult to detect? What would a ninth planet teach us about our corner of the universe? Could it help us unlock some of the mysteries of our solar system?

The computer animation Outside In explains the amazing discovery, made by Steve Smale in 1957, that a sphere can be turned inside out by means of smooth motions and self-intersections. Through a combination of dialogue and exposition accessible to anyone who has some interest in mathematics, Outside In builds up to the grand finale: Bill Thurston's "corrugations" method of turning the sphere inside out.

Zoo-archeologists, biologists, ethologists and geneticists are leading the investigation. For one thing is certain, the dog is still far from revealing all its secrets.

Billions of years ago, Venus may have harbored life-giving habitats similar to those on the early Earth. Today, Earth's twin is a planet knocked upside down and turned inside out. Its burned-out surface is a global fossil of volcanic destruction, shrouded in a dense, toxic atmosphere. Scientists are now unveiling daring new strategies to search for clues from a time when the planet was alive.

Smartphones, computers, gaming consoles or digital tablets are now givens in our daily lives. The electronic intrusion is causing controversy and collective hysteria. Are we damaging our brains with all these screens? How will unprecedented exposure to screens impact humanity? To find out, the filmmakers examine how science has been applied to distinguish between truth and falsehoods, and explore the suspected side-effects of screen exposure. The documentary travels through the US and Europe to meet and speak to researchers who are leaders in this field.

Explores the Pyramids of Giza as Egyptologists try to unravel the mysteries and decipher the clues behind these stone giants built over 4,500 years ago.

How were the giant stone heads of Rapa Nui – also known as Easter Island – carved and raised, and why? Since Europeans arrived on this remote Pacific island over 300 years ago, controversy has swirled around the iconic ancient statues and the history of the people who created them. Now, a new generation of researchers is overturning old theories, revealing the rich history, innovation, and resilience of the Rapanui people, and uncovering intriguing new evidence about where they – and their practice of monumental stone building – came from.

Documentary which uses the latest, most detailed imagery to reveal the monthly life cycle of the moon. From Wales to Wyoming, Hong Kong to Croydon, the programme finds out how the moon shapes life on Earth, as well as exploring its mysterious dark side and discovering how the moon's journey around Earth delivers one of nature's most awe-inspiring events - a total solar eclipse. And at the end of a remarkable year of lunar activity, we find out why so many supermoons have been lighting up the night sky.

Attack of the Red Sea Sharks investigates why sharks killed three people in less than a year in the coastal waters of Red Sea resorts. Multiple witnesses captured the gruesome attacks, with the videos quickly going viral, sparking confusion and hysteria. Are these attacks part of a growing trend that is becoming more common worldwide? A team of scientists launches a global pursuit to answer that question and find ways to prevent future attacks.

In the early 1900s, Albert Einstein developed an idea - called Relativity - that changed our understanding of reality. It explained how both space and time were flexible - and how the Universe was made of a four-dimensional fabric called space-time. This single idea gave us a new way to understand the force of gravity, explained how the stars were born and introduced us to the concept of the big bang. And, in the hands of Stephen Hawking, it allowed us to understand the most extreme monsters in the Universe - black holes. This two-part BBC documentary explores how two of the most famous scientists of the 20th Century transformed our understanding of the Universe - thus changing the world.

Professor of physics Jim Al-Khalili investigates the most accurate and yet perplexing scientific theory ever - quantum physics.