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The Infinite Hotel, a thought experiment created by German mathematician David Hilbert, is a hotel with an infinite number of rooms. Easy to comprehend, right? Wrong. What if it's completely booked but one person wants to check in? What about 40? Or an infinitely full bus of people? Jeff Dekofsky solves these heady lodging issues using Hilbert's...

Malte Spitz asked his cell phone carrier what it knew about him -- and mapped what he found out.

In 1943, Allied aircraft rained tens of thousands of leaflets on Nazi Germany below. The leaflets urged readers to renounce Hitler, to fight furiously for the future— and to never give up hope. Their call to action rippled through homes and businesses— and their message even reached concentration camps. They were signed: the White Rose. Iseult G...

Hubertus Knabe studies the history of torture, oppression and surveillance in former East Germany.

All it takes is a simple S to make most English words plural. But it hasn't always worked that way (and there are, of course, exceptions). John McWhorter looks back to the good old days when English was newly split from German -- and books, names and eggs were beek, namen and eggru! [Directed by Lippy, narrated by John McWhorter].

Under the label Laokoon, Moritz Riesewieck develops films, theatre productions, essays, lecture performances and radio plays that deal with the question of how our idea of humans and society change or can be transformed in the digital era.

In May 1940, with the German army ready to occupy Paris, Noor Inayat Khan was faced with a difficult choice: stand on the sidelines or join the Allied forces fighting the Nazis. After witnessing the devastation across Europe, she travelled to England to learn the art of espionage. Shrabani Basu details how a pacifist turned spy helped build the ...

Tour the deep dark world of the East German state security agency known as Stasi. Uniquely powerful at spying on its citizens, until the fall of the Berlin Wall in 1989 the Stasi masterminded a system of surveillance and psychological pressure that kept the country under control for decades. Hubertus Knabe studies the Stasi — and was spied on by...

In the German town of Nördlingen in 1593, innkeeper Maria Höll found herself accused of witchcraft. She was arrested for questioning, and denied the charges. She insisted she wasn't a witch through 62 rounds of torture before her accusers finally released her. Other accused witches weren't so "lucky." Why did these witch hunts occur? Brian A. Pa...

In 2013, the world learned that the NSA and its UK equivalent, GCHQ, routinely spied on the German government. Amid the outrage, artists Mathias Jud and Christoph Wachter thought: Well, if they're listening ... let's talk to them. With antennas mounted on the roof of the Swiss Embassy in Berlin's government district, they set up an open network ...

TED Talks are available in 102 languages, from Albanian to Vietnamese, thanks to the tireless work of our volunteer translators. So far, more than 10,000 volunteers have created upwards of 44,000 talk translations — and today, the TED Blog brings you a Q&A with one of them. Here, meet German translator Katja Tongucer. 1. Where do you live...

Mathias Basner researches the effects of noise on sleep, health, neurobehavioral and cognitive functions and more.

Under the label Laokoon, Hans Block develops films, theatre productions, essays, lecture performances and radio plays that deal with the question of how our idea of humans and society change or can be transformed in the digital era.

A thoughtful ode to health care, composed by Tilo Alpermann and performed on the TED@Merck KGaA, Darmstadt, Germany stage by Lars Jönnson.

Jochen Wegner edits Zeit Online, the website of German weekly "Die Zeit," which prizes deep dives into cultural issues.

Ralph Langner is a German control system security consultant. He has received worldwide recognition for his analysis of the Stuxnet malware.

A pioneering graphic designer in Egypt, Ghada Wali has designed fonts, brands and design-driven art projects.

Annette Heuser proposes critical reforms to loosen the iron grip of rating agencies on national credit scores.

With his unique inventions (including a device knitted from threads of high-tech alloy by indigenous craftswomen), Franz Freudenthal saves children from congenital heart defects.

Martina Flor combines her talents as designer and illustrator in the drawing of letters. Through her work as an artist and teacher, she has helped establish letter design in the European design scene.

One of the UK's sharpest funny men, Rory Bremner exposes the lunacies of modern politics with devilishly clever political satire and spot-on impressions of leaders from around the world.

Ji-Hae Park spreads the joy of classical to music to those who might not otherwise hear it -- and in the process shows that you can rock out on the violin.

Archaeologists routinely vet terrestrial construction and development projects to make sure they don't accidentally damage historical sites. Why not do the same for the moon? In this cautionary talk, space archaeologist Alice Gorman highlights the moon's prominent role in our culture and the importance of thoughtfully preserving it.

Are you looking closely? Visual educator Amy Herman explains how to use art to enhance your powers of perception and find connections where they may not be apparent. Learn the techniques Herman uses to train Navy SEALs, doctors and crime scene investigators to convert observable details into actionable knowledge with this insightful talk.

A full third of the world's population -- 2.6 billion people -- play video games, plugging into massive networks of interaction that have opened up opportunities well beyond entertainment. In a talk about the future of the medium, entrepreneur Herman Narula makes the case for a new understanding of gaming -- one that includes the power to create...

About this event: Students and alumni from the German School in Mexico City Campus Lomas Verdes and other guest speakers share their ideas with the community.

About this event: TEDxChange 2013 will take place on Wednesday, April 3, 2013 at 9:00am PDT in Seattle, Washington. Themed Positive Disruption, TEDxChange 2013 speakers will challenge preconceived ideas, spark discussion, engage leaders and shed light on new perspectives. TED.com will provide a free live stream of TEDxChange in English, French, German, Portuguese...

A pioneer in ocean exploration, David Gallo is an enthusiastic ambassador between the sea and those of us on dry land.

About this event: Our second 'FREE' TEDx Salon event of the year will feature Raphael Genis, an Israeli / German Jewish born entrepreneur who has been changing the way Chinese parents educate and raise their children.