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00:04:12
Red means stop, green means go—simple enough, right? But traffic lights are just a small part of the sophisticated science of traffic engineering. San Francisco Traffic Engineer Eddie Tsui takes us on a wild ride through his world, from computer simulations to ever-evolving detection technologies.

00:03:50
You've probably heard about the Texas-sized island of plastic trash swirling in the center of the Pacific Ocean. But did you know we have our own pockets of floating trash right here in San Francisco Bay? Join us on a trash safari with Sealife Convervation—a research and education group studying the volume, distribution, and sources of trash in the San Francisco and Monterey Bays.

00:04:16
Just outside the hum and buzz of San Francisco, there's a hum and buzz of a different sort. It's the sound of thousands of acres of almond crops being pollinated by bees—bees in such demand that they must be trucked in from as far as Texas. Almond grower Dave Phippen explains why. keeping this winged labor force happy and healthy is a vital but tricky business.

00:05:46
Come out to play on the concrete slides at Seward Street Mini Park in the Castro. A series of speed tests guided by physicist Paul Doherty takes on the question asked by sliders everywhere: How can I go faster?

No one puts the laws of physics to the test quite like the urban skateboarder. Join us for a closer look at the science behind the tricks of the sidewalk-shredding trade, from the basic ollie to high-flying aerial maneuvers.

00:03:14
The original multimedia storytelling device, puppetry dates back many thousands of years and spans cultures worldwide. Join us for a back-stage look at an artistic collaboration that brings together a composer, musicians, puppeteers, and, of course, puppets to bring a story to life.

00:05:20
Every night at Fort Funston, after all the people and dogs have left for the day, the bats come out to play. Dr. Gary Fellers of the U.S. Geological Survey tells us about bat vocalizations, the audio recordings he uses to monitor their travels, and the various species of bats that frequent this Golden Gate National Park.

00:05:00
Geocaching is a high-tech treasure hunting game played throughout the world by adventure seekers equipped with GPS devices. The basic idea is to locate hidden containers, called geocaches, outdoors and then share your experiences online. We take a trip around San Francisco and examine what treasures are hidden in plain sight and talk to a few geocachers to find out what all this means.

00:04:07
Twenty-seven miles beyond the Golden Gate, the craggy Farallon Islands have been home to fur-seal hunters from Russia, a gold-rush-era egg business, and even a nuclear waste dump. Today they’re home to 250,000 sea birds, not to mention seals, sea lions, whales, and sharks. What makes these stark-looking islands so attractive to wildlife?

00:05:26
The ground under our San Franciscan feet is constantly on the move. Join Exploratorium educator Ken Finn as we visit some spots around town where exposed rocks reveal the tale of an active earth.