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Corrupt officials and criminal operators are brilliant at hiding their money and actions from public view. But there’s something we can do about it, says the team at Global Witness. It starts with closing loopholes.

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Jason deCaires Taylor casts giant cement sculptures that weigh thousands of pounds — and then sinks them into the ocean. His idea: to create a unique underwater gallery that algae, corals and other sea creatures can call home.

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When artist JR started a project about the 1.2 million people held in limbo at the Ellis Island Immigrant Hospital in the early 20th century, he couldn’t help but notice ghosts of the present.

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Here’s a riddle for you: A plane flew for five days and nights, staying airborne for 118 hours. But it didn’t use a single drop of fuel. How? Bertrand Piccard explains.

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Daniel Kish has been blind since he was 13 months old. He navigates the world using echolocation, sending out flashes of sound that bounce off objects and back to let him construct an understanding of the space around him. He let Kate Torgovnick May tag along as he got ready for TED.

From a distance, "Letter to Peter Parker" may seem relatively simple. But when you get up close, things get interesting. "The text repeats over and over and essentially thanks Peter Parker for all the reasons I used to relate to him as a kid," says Hetain Patel. "He helped make me who I am today.”

Take a closer look at a new sculpture by artist Hetain Patel which involves a fiberglass Spider-Man suit and a very fervent thank you letter.

Comfort food in space: the final frontier | ideas.ted.com | Illustration by John Holcroft.

The past, present and future of food in space — from astronaut ice cream to “Enchilasagna” on Mars.