QUEST Community Science Blog

What does our use of bottled water say about us? View our 2-minute TV short “Future History: Plastic Water Bottles” to take a look from the perspective of an anthropologist from the distant future, and the take our poll below:

Josh Rosen is Series Producer for QUEST on KQED Television.

Is your face giving you away? This week, QUEST met renowned psychologist Paul Ekman, who has spent his life studying how our facial muscles involuntarily reveal emotions like sadness and anger. In 1976, Dr. Ekman and his colleague Dr. Wallace Friesen published the Facial Action Coding System, or FACS, a system that comprehensively inventoried the muscles movements that create smiles, frowns and grimaces.

Each movement is categorized in Action Unit (AUs). When you puff your cheeks, it’s known as AU13. The Frontalis muscle, located on the forehead, is responsible for AU1 or the “Inner Brow Raiser”. Over the course of their extensive research, Ekman and Friesen determined that there are at least 19 different versions of smiles! For more information and additional resources on FACS, visit the Data Face website.

If you live in the Bay Area, you can see a special exhibit at San Francisco’s Exploratorium with more of Dr. Ekman’s photos. It’s open through May 11.

Watch the “Emotions Revealed” TV Story online, as well as find additional links and resources.

Jenny Oh is an Associate Producer for QUEST on KQED Television.

In 1968, John Dobson started the San Francisco Sidewalk Astronomers with the help of two boys who loved astronomy but couldn’t join an amateur astronomy club in the city because they were too young. So the trio created their own club, carting two homemade telescopes onto Jackson and Broderick Streets and inviting curious passersby to take a look at the craters of the moon, the rings of Saturn, the banded clouds of Jupiter.

Forty years later, the San Francisco Sidewalk Astronomers is still going strong, boasting a web site replete with a monthly star chart, specific for San Francisco, a calendar of monthly amateur astronomy events, a helpful “cheat sheet” of astronomical facts and answers to questions that routinely come up if you set up a telescope on your neighborhood sidewalk, and where to go if you want to borrow, build or donate a telescope.

Another great resource for the budding SF amateur astronomer is the Randall Museum, which hosts star parties, lectures by amateur and professional astronomers and classes for making your own Dobsonian telescope from scratch. The free public lectures at the Randall Museum take place on the third Wednesday of each month, sponsored by the San Francisco Amateur Astronomers.

Since 1952, the San Francisco Amateur Astronomers have been an invaluable resource for stargazers to learn about the choicest observing sites throughout the Bay Area, monthly star parties and make contact with a community of like-minded folks. Be sure to also check out their astrophotography web page, where they have uploaded photos and even videos shot with their telescopes of galaxies, comets, moons, planets and nebulae.

If you can’t get enough of amateur astronomy clubs in the Bay Area, check out the Astronomical Society of the Pacific and the Astronomical Association of Northern California. The Astronomical Society of the Pacific, founded in the 19th century, has members from 70 countries and claims to be the largest astronomy society in the world. It also boasts educational outreach programs, such as Astronomy from the Ground Up, a National Science Foundation-funded program that helps informal science educators such as docents and volunteers by giving them the tools and training to more effectively communicate astronomy information to the public.

If you should need to buy equipment or talk with some very knowledgeable folks about the right telescope, accessories or CCD digital camera to begin your foray into astrophotography, check out Scope City, a retailer in San Francisco specializing in telescopes and binoculars.

Watch the “Amateur Astonomers” TV Story online, as well as find additional links and resources.


Sheraz Sadiq is an Associate Producer for QUEST on KQED Television.

These fish can tell us a lot about ourselves.

Species often end up a different color when their environment changes. And humans are no exception.

When people moved out of Africa tens of thousands of years ago, they were dark-skinned. Now when we look around Northern Europe or parts of Asia, we see much lighter people. What happened?

A common explanation has to do with sunlight and vitamin D. When people moved north, they got less sun. Less sun means less vitamin D and awful diseases like rickets.

Anyone who moved north and had lighter skin ended up getting more vitamin D and did better than their darker neighbors. After awhile, most of the population had light skin.

This is all well and good, but what happened at the gene level to cause this transformation? One way scientists are learning about how humans ended up with lighter skin is by studying fish. For example, the zebrafish has taught us a lot about why Europeans are often so pale.

The zebrafish is an important model system that scientists use to study vertebrate development, human disease, and lots of other things. A common mutant fish that scientists use in these studies is called “golden.” These fish have lighter, yellowish stripes instead of black ones.

Scientists discovered that these mutant fish had yellow stripes because of a single DNA difference (or SNP*) in their SLC24A5 gene. When fish have this DNA difference, they have yellow stripes.

These scientists next looked for this gene in people. What they found was that most of the people they looked at had two copies of the “black stripe” version of the gene. Except for Europeans. They tended to share a common SNP in their SLC24A5 gene that the scientists went on to show is a big part of why many Europeans have lighter skin.

Another group of researchers decided to dig a bit deeper and find out when this transformation happened. By looking at the DNA around SLC24A5, they found that lighter skin came to dominate Europe around 6,000-12,000 years ago. At first this result is a bit confusing because humans moved into Europe around 40,000 years ago. Why did it take so long for lighter skin to become the norm?

Scientists can’t know for sure but one idea is diet. Around this time, Europeans started to grow their own food. And a farmer’s diet has less vitamin D than does a hunter-gatherer’s diet. Maybe the lack of sun only started to affect Europeans after they started growing their own food. Then, after a relatively brief time, most Europeans ended up fair-skinned to get enough vitamin D.

This gene doesn’t explain all of skin color. For example, it doesn’t explain the difference in color between Northern and Southern Europeans. Or why some Asians have fair skin. But it does explain a good deal of European coloration. Thanks, zebrafish!

*SNP=single nucleotide polymorphism

Dr. Barry Starr is a Geneticist-in-Residence at The Tech Museum of Innovation in San Jose, CA.

Last week on QUEST, we took a look at the history of the San Francisco Bay’s most dangerous toxin: mercury. This week, now that the mercury is here in the bay, how is it affecting us? The obvious place to go was the Berkeley Marina, one of the bay’s most popular fishing spots. On the day I visited, halibut season had just begun and, even on a Monday morning, the pier was lined with anglers. Halibut contains high levels of mercury, just like other big SF Bay fish but – as you hear in the piece – you wouldn’t know it from talking to the fishermen out that day.

Of course mercury is a problem in many big fish we eat, not just the ones in the San Francisco Bay. Dr. Jane Hightower is one of the leading local doctors diagnosing various levels of mercury poisoning in her patients – many of whom, as she says, do their fishing at places like Whole Foods. We only had time to use a short piece of that interview in the actual story, but anyone who eats fish will want to hear more from Dr. Hightower. A longer version of that interview – including Dr. Hightower’s surprising views on kid staples like canned tuna fish – is right here.

You may listen to the “Mercury in the Bay - Part 2″ Radio report online, as well as find additional links and resources.

Amy Standen is a Reporter for QUEST and Radio News at KQED-FM.

Artist concept of a geyser erupting on Enceladus.
Credit: David Seal.Back when I was young…okay, a previous generation might have ended that sentence with, “…I’d walk forty miles through the snow to get to school…” But I’m not exaggerating when I say, when I was young we knew next to nothing about faraway places in the Solar System…such as the moons of Saturn.

A layer of the veil around Saturn’s moons was removed when Pioneer 11 and Voyagers 1 and 2 made flybys of Saturn in the ’70s and ’80s. The Saturnian moons, it appeared, were not the lumps of rock and dust that Earth’s own Moon is made of, but objects containing no small amount of water ice. Not terribly surprising, considering the low temperatures of the outer solar system where ice-rich comets roam.

Visions of frozen alien landscapes, replete with icicles and ice cliffs and ice fields and ice ice ice! were conjured in my imagination, and in artist depictions of majestic ringed Saturn seen from moons like Rhea or Dione or Enceladus.

Four years ago, Saturn’s first permanent visitor from Earth–the Cassini spacecraft–arrived there, and since has been making extreme closeup examinations of Saturn, its rings, and its increasingly wondrous and beautiful moons. Cassini is almost literally ripping apart veil after veil of our ignorance of these little worlds.

Far from a contingent of enormous but simple snow cone balls, Cassini has shown us that some of Saturn’s moons are apparently alive with liquid motion. First, there were the surface “lakes” and “seas” on Titan, probably made of extremely cold liquid hydrocarbons like methane and ethane–the stuff that spouts out of the gas range in your kitchen. Lakes and seas and rolling waves of liquid natural gas are fine and dandy for an imagined shoreline scene–but take a dip in those “waters” and an actual water-based creature like you would freeze solid in seconds. Scenic, but not inviting for a swim…

But recent observations by Cassini have shown that Titan’s frigid unearthly lakes and Enceladus’ snowball exterior may just be additional veils that are now being lifted.

In March, Cassini flew within 30 miles of the surface of Enceladus and right through a plume of material venting into space from the moon’s interior—an enormous “geyser.” Earlier observations had sensed the presence of water in the plume, giving rise to speculation that liquid water in some form might exist beneath Enceladus’ surface—perhaps chambers of liquid heated by tidal stressing of the interior.

When Cassini flew through the plume, its chemical sensors “sniffed” more than just water in the stream, but a good deal of organic molecules as well…not unlike material found in comets, stuff left over from the formation of the Solar System that may have been the building blocks of life on Earth.

The other “water find” was that of a possible liquid ocean under the crust of Titan–similar perhaps to the deep liquid water ocean believed to exist under the surface of Jupiter’s moon Europa. Unexpected “drift” in the locations of landmarks on Titan’s surface is what suggests a liquid ocean–water with perhaps some ammonia–that the frozen crust may be floating on.

With all the liquid water and organic chemistry being revealed in the Saturn system (and elsewhere in the outer solar system), our imaginations can shift from the older standards of envisioning otherworldly landscapes of sculpted ice or even seascapes of liquid hydrocarbon lapping on shores of water ice sand, to something a little more, shall we say, “lively…”?

Benjamin Burress is a staff astronomer at The Chabot Space & Science Center in Oakland, CA.

And live in an aquarium in my living room?

A fish tank calms my nerves. A fish tank connects me to the sea. A fish tank brings peacefulness into my hectic world. These are the words of marine aquarium owners. The lure of a tropical fish tank is clear: they are mesmerizing and colorful, they are relaxing to gaze at and they bring real sea creatures right into one’s home. In fact, between 1.5 and 2 million people worldwide feel this way, and keep marine aquariums, including 800,000 households in the United States alone.1,471 species of fish are traded worldwide, with global trade ranging between 20 and 24 million individual fish annually.

Unfortunately, not enough aficionados of tropical fish know how these beautiful beings got to their local tropical fish store. Fewer than 10% of the fish are captive-bred, meaning most are collected from their coral reef habitats off of places such as Indonesia.

Most collectors are men from small villages, who make mere pennies on their catches. Though they sometimes use nets and their own hands, often they employ squirt bottles full of cyanide. As a result of cyanide use, mortality rates of captured fish are between 5% and 75% within hours of collection, with 20% to 50% of survivors dying soon thereafter. Of those that survive the collection process, another 30% on average die prior to export. Collection using cyanide results in an overall survival rate of less than 1 in 10 fish, at best, and often produces 100% mortality.

For those that make it out of their country of origin and onto a plane, eight out of ten will die en route from lack of oxygen, stale water and trauma. For U.S. export, most of these bagged fish are sent to “fish row” in Los Angeles where they are distributed to fish supply stores all over the country.

The good news is that once tropical fish collectors know more, they tend to act. More and more collectors are asking suppliers about their collection techniques and making informed decisions. Reef Project International is a project of Earth Island Institute (and the supplier of most of this information). They have created a Reef Fish Guide for the aquamarine hobbyist that lets them know if a particular fish falls under “Take it Home” or “Keep it Wild”. The guide is available at (www.reefprotect.org). The hope is that when consumers demand sustainable and humane tropical fish, suppliers will respond, and fish and their habitats will benefit.

By the way, Clownfish, like Nemo, are one of the few species that can be captive-bred.

Amy Gotliffe is Conservation Manager at The Oakland Zoo.

Making Every Photon Count

Last week I went to a talk given by the leader of the Supernova Factory collaboration at LBNL. What is SN factory? This is an ambitious project to study supernovae like never before. I mentioned this project briefly in a previous post , now that they are so close to releasing their results I want to discuss it a bit more.

The main idea of this project is to study several hundred nearby supernovae using an instrument known as the Supernova Integral Field Spectrograph, or SNIFS. This type of instrument is essentially a blend between a traditional imaging camera and a spectrograph.

The resolution in an integral field spectrograph is defined in spaxels instead of the pixels that have become all too familiar with the advent of digital cameras. A spaxel is quite similar to a pixel, there aren’t nearly as many and each one carries at least a 1000 times as much information.

In your digital camera, the light passes through the lens and directly onto the CCD. Each pixel on the CCD counts the number of photons in the red, the blue, and the green. Typically, there are millions of pixels, each counting photons from a slightly different region of the subject of your photograph.

Now imagine that instead of just counting red, green, and blue, that each pixel counts the entire rainbow of light from your subject. Now you have a spaxel. In an intregral field unit, the light passes through an array of microlenses and prisms before landing on the detector. We would call each set of microlenses and prisms a spaxel. The resulting image carries information about every wavelength of light from every region of your target.

Spectrum of the first SN observed with SNIFSThe advantage to an integral field spectrograph like SNIFS is that you gain a lot more information than either an imager or spectrograph alone. With an integral field spectrograph you can basically identify and organize every photon that reaches the telescope.

Specifically designed to observe supernovae, SNIFS is being operated at the 88-inch telescope on Mauna Kea. Spaxels are quite expensive - this particular instrument has only 225. However, this is more than enough to observe the entirety of a galaxy, a supernova, and the background.

The members of the SN Factory have now observed over 100 SNe using this new camera. Last Thursday, I saw the data from the first 25 well-calibrated supernovae and was very impressed. The data showed the evolution of each supernova and the properties of the host galaxy in great detail. I’m sure the supernova community will be equally impressed when they first see these new results.

Kyle S. Dawson is engaged in post-doctorate studies of distant supernovae and development of a proposed space-based telescope at Lawrence Berkeley National Laboratory.

View Larger Map

In honor of Earth Day, we wanted to take a big look at a chronic environmental issue in the Bay Area, tracing it from its origins to the contemporary strategies to solve it. Mercury was the obvious choice: It’s been flowing into the Bay since before California joined the union, and it continues to trickle in from not just the old culprits, like gold and mercury mines, but a modern crop of industries, like refineries and cement kilns. Even little things – like a broken mercury thermometer dumped into the sink – are part of the problem.

The key fact here is how incredibly potent mercury can be: Just one little globule from an old thermometer can poison all the fish in a 45-acre lake, making them unsafe for humans to eat. Mercury pollution is hardly unique to the Bay Area; what makes us interesting is that local officials are making real strides in trying to clean it up. Over the next 17 years or so, we’ll spend $2.6 billion dollars on the project. Even then, we won’t have a clean bay for 120 years.

For a lot of people, mercury pollution in the Bay is largely theoretical, since few stores sell fish caught in the Bay, and relatively few residents fish for their food. But some still do – including many recent immigrants from fishing-intensive cultures like Laos. We’ll look at how mercury affects the health of local fishermen next week.

This piece marks our first-ever audio slide show, and what a difference it makes! We also hope you’ll check out the mercury map above, where you can see how many pounds of mercury come from each of the Bay Area’s five refineries, plus other mercury sources and the bay’s popular fishing spots.

Watch the audio slide show of “Mercury in the Bay” online, as well as find additional links and resources.

Amy Standen is a Reporter for QUEST and Radio News at KQED-FM.

These 5 folks are full of bright ideas.
Image Source: PiccoloNamekACI trains home performance professionals through national and regional conferences and through the Web. Last week I participated in my eighth ACI national conference. The annual conference is where I go to network; learn about all aspects of home performance; recruit authors for Home Energy Magazine; and best of all, be inspired.

Here are a few of the people that I ran into last week who inspire me:

Don Fugler does research through the Canada Mortgage and Housing Corporation. He developed the Garbage Bag Air Flow Test. He rides his bike to work year round in Ottawa, and wears suspenders. He has a dry sense of humor and has toppled any lingering stereotype I had about Canadians. He told a crowded room at the ACI meetings in Pittsburgh that the way we live in our houses, the way we use our cars, and the way we travel in the air contribute about equally to our carbon footprints. The way we eat contributes a lot also. A pound of beef is responsible for a heck of a lot of greenhouse gases released. I don’t know if Don is a vegetarian, but I think he probably is.

Jim LaRue is a sort-of-retired home performance contractor from Cleveland, Ohio. He designed a really efficient and healthy house for a group of nuns in Ohio and wrote about it for Home Energy. He has also written for the Cleveland Green Building Coalition and for the magazine a Greening Your Home series of articles. I don’t know anyone who has worked harder to create healthy, efficient, and affordable housing in Cleveland. He’s retired but so far no one has noticed.

Linda Wigington has been with ACI since its beginning and is now the manager of program design and development. At the ACI Summit on global climate change held at the Pacific Energy Center in San Francisco last summer, which she was instrumental in bringing about, she talked about how she lived one whole winter in her home outside of Pittsburgh while never raising her thermostat above 50 degrees Fahrenheit. She is passionate about finding ways (mostly not involving such personal discomfort) to drastically reduce the energy use in existing homes to reduce the nation’s greenhouse gas emissions.

Kate and Paul Raymer, founders of Hayoka Solutions, a green building and green building advocacy organization, announced the Starting from Home Challenge at the ACI meetings, an annual contest for post secondary school students around the country to create 70%–90% energy savings in existing homes with real people living in them. Hayoka is a Lakota Indian word describing someone who causes others to see things in a completely new way. Paul is an expert in healthy home ventilation. Don’t get him started on attached garages. “Why would anyone park their car in their house?” Paul often wonders.

I could go on, and on, and on. These are just a few of the people who inspire me. I hope they inspire you as well.

Jim Gunshinan is Managing Editor of Home Energy Magazine. He holds an M.S. in Bioengineering from Pennsylvania State University, State College, Pennsylvania, and a Master of Divinity (MDiv) degree from University of Notre Dame.