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If we suddenly disappeared, what would happen to our planet?

Gravity. The stars in day. Thoughts. The human genome. Time. Atoms. So much of what really matters in the world is impossible to see. A stunning animation of John Lloyd's classic TEDTalk from 2009, which will make you question what you actually know.

What is the oldest living thing in the world?

How does evolution really work? Actually, not how some of our common evolutionary metaphors would have us believe. For instance, it's species, not individual organisms, that adapt to produce evolution, and genes don't "want" to be passed on -- a gene can't want anything at all! Alex Gendler sets the record straight on the finer points of evolution.

Me and my friend walking on frozen mountain lake in High Tatras Mountains in Slovakia.

I'm filming a documentary for TV about how Uranium and radioactivity have shaped the modern world. It will be broadcast in mid-2015, details to come. The filming took me to the most radioactive places on Earth (and some places, which surprisingly aren't as radioactive as you'd think). Chernobyl and Fukushima were incredible to see as they present post-apocalyptic landscapes. I also visited nuclear power plants, research reactors, Marie Curie's institute, Einstein's apartment, nuclear medicine areas of hospitals, uranium mines, nuclear bomb sites, and interviewed numerous experts.

Here's A Review Of The Moments Of 2014, But You Need To See The Twist

Chernobyl is one of the most interesting and dangerous places I've been. The nuclear disaster, which happened in 1986; the year after I was born, had an effect on so many people, including my family when we lived in Italy. The nuclear dust clouds swept westward towards us. The Italian police went round and threw away all the local produce and my mother rushed out to purchase as much tinned milk as possible to feed me, her infant son.

Agriculture, hula hoops, SARS, and THIS video: how long did they take to get around the earth?

What is the maximum height for a mountain on Earth!? And why?

It's a question that you'd think kids have been asking for thousands of years, but it might not be that old at all. The ancient Greek poet Homer never used a word for blue in The Odyssey or The Iliad, because blue is one of the last colors that cultures pick out a word for.

Save the Arctic - Watch and share.

Space might seem like an empty place, but the area surrounding Earth is constantly being bombarded by waves of charged particles released by the Sun: The solar wind. Luckily, thanks to Earth's swirling, molten core (and the magnetic field it provides), we are protected from this planet-sterilizing onslaught like an invisible force field.

The video shows you the beautiful Great Bear Rainforest that is located on the central coast of British Columbia.

While there's no shortage of weird and wacky ideas in science fiction about what creatures from other planets might look like, few are quite as remarkable as those that can actually be found right here on Earth.

After the first date with his girlfriend, Jack Hyer knew he would marry her. He wrote in his travel journal in 2010, "I'm going to marry this girl eventually." He has since traveled across the world in over 25 different countries.

The Drinkable Book is a life saving tool that filters water and teaches proper sanitation & hygiene to those in the developing world.

Baltimore Landslide April 30th, 2014

Skydive Dubai sponsored Soul Flyers World Champions Vince Reffet and Fred Fugen break a new World Record by BASE jumping from above the pinnacle of the World's Tallest Building.

We live in a world of unseeable beauty, so subtle and delicate that it is imperceptible to the human eye. To bring this invisible world to light, filmmaker Louie Schwartzberg bends the boundaries of time and space with high-speed cameras, time lapses and microscopes. At TED2014, he shares highlights from his latest project, a 3D film titled "Mysteries of the Unseen World," which slows down, speeds up, and magnifies the astonishing wonders of nature.

After announcing Internet.org last year, an initiative to improve Internet access across the globe, Mark Zuckerberg unveiled the Connectivity Lab, a new team of scientists that has been working on the ambitious project. He said that the Connectivity Lab would develop "new platforms for connectivity on the ground, in the air and in orbit," according to a post on Internet.org on Thursday. How are they going to do it?