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Scientists have used brain scans to shed more light on how the brain deals with the memory of unpleasant or traumatic events during sleep.

As Switzerland opens the world's longest and deepest rail tunnel, the BBC's Imogen Foulkes assesses the huge challenge that engineers faced.

A hiker who got lost on a remote part of the Appalachian Trail in the US sent text messages appealing for help for 26 days before she died.

The background light filling the Universe holds a history that stretches before the Big Bang, a renowned cosmologist suggests.

As Moody's, one of the big three credit ratings agencies, cuts its outlook for the UK's economy from "stable" to negative", BBC News explains what the agencies do.

Most children are exposed to online pornography by their early teenage years, leaving them at risk of becoming "desensitised", a study warns.

The IndieWeb is a people-focused alternative to the “corporate web”.

A dig is under way for a so-called "Nazi gold train" rumoured to be hidden near Walbrzych in south-western Poland.

The BBC's Justin Rowlatt writes about the history of Kolkata's (Calcutta) famous egg rolls.

With the UN set to announce that there are now seven billion people on the planet, BBC News speaks to seven people from around the world to hear their stories.

The Royal Spanish Academy invites the public to read a section from the 17th Century novel Don Quixote - and upload it to YouTube.

Victor Keegan: Thanks to its team of volunteers, OpenStreetMap has now mapped most of the world – including Haiti

POSSE is an abbreviation for Publish (on your) Own Site, Syndicate Elsewhere, the practice of posting content on your own site first, then publishing copies or sharing links to third parties (like social media silos) with original post links to provide viewers a path to directly interacting with your content.

We live in the most peaceful time in human history. Wait, what? Seriously? That can't be right, there are more wars than ever! Well, no and they're killing f...

Thanks for watching! I actually had an early version of this ready last week. Which you can watch here on my second channel: https://www.youtube.com/watch?v=...

Europe's comet lander Philae, last seen in November 2014, has been identified in new pictures from the Rosetta probe.

Relief reaches five Russian scientists besieged by polar bears for nearly two weeks at a remote weather station on Troynoy Island in the Arctic.

An impressive underground network of tunnels and caves, curiously filled with vintage cars and forgotten World War II relics, lay forgotten under the ancient city of Naples.

Images shortlisted for the People's Choice Award in the Wildlife Photographer of the Year competition.