Happy Halloween! We may not have tricks or treats here at TEDx, but we do have something really cool — a TEDx Talk on the bat genome!

Bats are a little spooky, but, biologically, they are pretty spectacular. For example, did you know that one fifth of all mammals are bats and bats are the only mammal that can fly?

As the director of The Centre for Irish Bat Research, Emma Teeling knows a lot about these fascinating creatures, and in the talk at TEDxDublin below, she shares her knowledge, revealing how the bat genome can actually give us great insight into ourselves.

Check out Teeling’s entire talk below:

(Photos — Row 1: afagen; Row 2: Lee Carson, James Niland)

From a treehouse to a Titanic replica: The best TEDx venues

From the TED Blog’s week-long celebration of TEDx:

Now 5,000+ events and 20,000+ talks strong, TEDx’s “x” has made its way to some marvelously unexpected places. From the staircase of a full-size reproduction of the Titanic to a base camp in Antarctica, TEDx venues are far from ordinary. Below, nine of our favorite venues from TEDx events past.

What would a great wonder of the world be without a TEDx? At TEDxGreatWall in 2011, TEDx’ers took over the Jinshanling section of the Chinese landmark, marking this historic landscape with ideas worth spreading.

Looking like a cross between a UFO and an amusement park ride, TEDxBrainport’s venue might have had its audience thinking “aliens” at first. Located in the tech-savvy Brainport Eindhoven region of The Netherlands, TEDxBrainport’s former science museum locale easily set the scene for visions of the future.

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Radio wave real estate: Linda Doyle

Have you ever tried to send a text message on New Year’s Eve? Linda Doyle explains why that’s hard. “Smart” devices are ubiquitous, she says, while radio waves, which these devices rely on to function, are becoming scarce — and unless we change the way we operate networks, wireless won’t work. (Filmed at TEDxDublin.)

Each week, we choose four of our favorite talks, highlighting just a few of the enlightening speakers from the TEDx community, and its diverse constellation of ideas worth spreading. Browse all TEDxTalks here »

TEDxTalks playlist: 5 talks on envisioning the city of the future—the City 2.0

What will the city of the future look like? According to the United Nations, by the year of 2050, 70% of the world’s population will be living in urban areas. Questions dominate our conception of the “City 2.0”: How will we transport ourselves? Where will we grow our food? How will we power our homes, our offices, our cities? What will happen to the natural world?

On October 13, 2012, communities across the globe will be asking these questions as part of TEDxCity2.0 day, a day during which nearly 70 TEDx events will be held in conjunction to dream the city of the future.

To celebrate the City 2.0 and the spirit of urban inspiration, here are 5 great TEDxTalks on the future of cities across the globe.

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