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The drinking water provided for San Francisco and many nearby communities is among the purest in the world. Located high in the Sierras, more than 200 miles away, Hetch Hetchy reservoir holds most of this water which is fed by springtime snowmelt via the Tuolumne River. The system for delivering that water is almost entirely gravity fed, requiring almost no fossil fuel consumption to move water from the mountains to the tap. Take an exclusive tour with the San Francisco Public Utilities Commission (SFPUC) as they lead us through this unique system and address the current drought and how to conserve water.

A dozen whales, different species and ages, have washed up recently on nearly 300 miles of Northern California coastline. While this is not a record, it's still alarming. Why is it happening? Bay Area scientists are considering factors such as environmental changes, food distribution, shipping, ocean currents, and predator behavior. Meet staff from the California Academy of Sciences, Mission Science Workshop, and the Exploratorium, and explore evidence leading to and hypotheses about these tragic events.

Height confers advantages in many sports—to a point. But what if you’re too tall to even safely fit on a bicycle? Bike builder David Folch shares both the engineering challenges and the joy of creating supersized bikes for supersized riders.

Experimental physicist Carl Haber restores antique audio recordings too old, fragile, or damaged to be otherwise replayed—including recordings made in wax, soot, and foil. Using optical scanning technologies from his work at CERN in Switzerland, Haber has recovered and preserved a diverse collection of deteriorating sonic artifacts, voices from the past that otherwise would have been lost.

With the ever shifting boundaries between humans and wildlife in the Bay Area, the daily routine for many has it's challenges and rewards for all involved. Based on biological studies and direct experiences, we focus on a few of our favorite neighboring species who interact with us humans, and our way of life, in more ways than you may think.

Curious about Tofu? The folks over at Hodo Soy Beanery tell us everything we ever wanted to know about how Tofu (and its "sexier cousin" Yuba) is made. Music by Wayne Grim For more information on Hodo Soy Beanery- http://hodosoy.com

Navigating bustling city streets can be a challenge for anyone at times. Can you imagine crossing a busy street, walking up a flight of stairs or using public transportation without the gift of sight? In this Science in the City you'll catch a glimpse of how Guide Dogs for the Blind envisions a world with greater inclusion, opportunity, and independence by optimizing the unique capabilities of people and dogs.

Buried in a cove that later became downtown San Francisco, a Gold Rush-era cargo ship lay lost and forgotten underground until it was exposed by construction in 2013. Marine archeologists and historians share stories of the discovery, excavation, and preservation of this humble yet significant 23-foot maritime artifact, unique among the oldest intact boats in the United States.

What are salt ponds and why are they are being restored to their natural habitat? The South Bay Salt Pond Restoration Project is the largest tidal wetland restoration project on the West Coast. When complete, the project will restore 15,100 acres of industrial salt ponds to a rich mosaic of tidal wetlands and other habitats. For more information go to http://www.southbayrestoration.org .

Ever notice a brick-lined circle embedded into a street intersection? Keep an eye out and you'll see them throughout San Francisco. As part of the San Francisco Fire Department's Auxiliary Water Supply System, these brick circles indicate a cistern full of water. Join SFFD's Chief Ken Lombardi and Firefighter Hashim Anderson as they discuss the history and function of these cisterns, and demonstrate the drafting procedures used to access the water.