Would you live in a floating city in the sky? (with English subtitles) | Tomás Saraceno

(Full English subtitles are available for this talk — click the CC button in the bottom right of your screen to turn subtitles on.) In a mind-bending talk that blurs the line between science and art, Tomás Saraceno exhibits a series of air-inspired sculptures and installations designed to usher in a new era of sustainability, the “Aerocene.” From giant, cloud-like playgrounds suspended 22 meters in the air to a balloon sculpture that travels the world without burning a single drop of fossil fuel, Saraceno’s work invites us to explore the bounds of our fragile human and terrestrial ecosystems. (In Spanish with English subtitles.) Check out more TED Talks: http://www.ted.com The TED Talks channel features the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less).

A smog vacuum cleaner and other magical city designs | Daan Roosegaarde

Daan Roosegaarde uses technology and creative thinking to produce imaginative, earth-friendly designs. He presents his latest projects — from the sidewalks of Amsterdam, where he reinterpreted “The Starry Night” to get people thinking about green energy, to Beijing, where he developed a smog vacuum cleaner to purify the air in local parks, to a dance floor that generates electricity to power a DJ booth.

What it feels like to see Earth from space | Benjamin Grant

What the astronauts felt when they saw Earth from space changed them forever. Author and artist Benjamin Grant aims to provoke this same feeling of overwhelming scale and beauty in each of us through a series of stunning satellite images that show the effects human beings are having on the planet. “If we can adopt a more expansive perspective, embrace the truth of what is going on and contemplate the long-term health of our planet, we will create a better, safer and smarter future for our one and only home,” Grant says.

A dance to honor Mother Earth | Jon Boogz and Lil Buck

Movement artists Jon Boogz and Lil Buck debut “Honor thy mother,” a delicate, powerful performance of spoken word, violin and dance that draws on the tormented relationship between nature and humanity. The TED Talks channel features the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less).

Meet the microscopic life in your home — and on your face | Anne Madden

Behold the microscopic jungle in and around you: tiny organisms living on your cheeks, under your sofa and in the soil in your backyard. We have an adversarial relationship with these microbes — we sanitize, exterminate and disinfect them — but according to microbiologist Anne Madden, they’re sources of new technologies and medicines waiting to be discovered.

How computers learn to recognize objects instantly | Joseph Redmon

Ten years ago, researchers thought that getting a computer to tell the difference between a cat and a dog would be almost impossible. Today, computer vision systems do it with greater than 99 percent accuracy. How? Joseph Redmon works on the YOLO (You Only Look Once) system, an open-source method of object detection that can identify objects in images and video — from zebras to stop signs — with lightning-quick speed.