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Making Unique Observations in a Very Cluttered World

Monday 4 August 2014

MIT researchers can listen to your conversation by watching your potato chip bag - 



Imagine someone listening in to your private conversation by filming the bag of chips sitting on the other side of the room. Oddly specific, I know, but researchers at MIT did just that: They’ve created an algorithm that can reconstruct sound (and even intelligible speech) with the tiny vibrations it causes on video.

When sound hits an object, it makes distinct vibrations. “There’s this very subtle signal that’s telling you what the sound passing through is,” said Abe Davis, a graduate student in electrical engineering and computer science at MIT and first author on the paper. But the movement is tiny – sometimes as small as thousandths of a pixel on video. It’s only when all of these signals are averaged, Davis said, that you can extract sound that makes sense. By observing the entire object, you can filter out the noise.

This particular study grew out of an earlier experiment at MIT, led by Michael Rubinstein, now a postdoctoral researcher at Microsoft Research New England. In 2012, Rubinstein amplified tiny variations in video to detect things like the skin color change caused by the pumping of blood. Studying the vibrations caused by sound was a logical next step. But getting intelligible speech out of the analysis was surprising, Davis said.

The results are certainly impressive (and a little scary). In one example shown in a compilation video, a bag of chips is filmed from 15 feet away, through sound-proof glass. The reconstructed audio of someone reciting “Mary Had a Little Lamb” in the same room as the chips isn’t crystal clear. But the words being said are possible to decipher.

In most cases, a high-speed camera is necessary to accomplish the feat. Still, at 2,000 to 6,000 frames per second, the camera used by the researchers is nothing compared to the best available on the market, which can surpass 100,000 frames per second. And the researchers found that even cheaper cameras could be used.

“It’s surprisingly possible to take advantage of a bug called rolling shutter,” Davis said. “Usually, it creates these artifacts in the image that people don’t like.” When cameras use rolling shutter to capture an image, they don’t capture one single point in time. Instead, the camera scans across the frame in one direction, picking up each row at a slightly different moment.

By doing so, the camera happens to encode information at a much higher rate than its actual frame rate. For the researchers, that meant being able to analyze vibrations that should have happened too quickly for capture on film. “It kind of turns a two-dimensional low-speed camera into a one-dimensional high-speed camera,” Davis explained. “As a result, we can recover sounds happening at frequencies several times higher than the frame rate of the camera, which is remarkable when you consider that it’s just a complete accident of the way we make them.”

There are definitely limitations to the technology, Davis said, and it may not make for better sound reconstruction than other methods already in use. “Big brother won’t be able to hear anything that anyone ever says all of a sudden,” Davis said. “But it is possible that you could use this to discover sound in situations where you couldn’t before. It’s just adding one more tool for those forensic applications.”


Davis and his colleagues care more about applications in scientific research. “This is a new dimension to how you can image objects,” he said. “It tells you something about how they respond physically to pressure, but instead of poking and prodding at them, all you need is to play sound at them.”



Read more -
http://www.washingtonpost.com/news/speaking-of-science/wp/2014/08/04/mit-researchers-can-listen-to-your-conversation-by-watching-your-potato-chip-bag/

Male bass switch sex - male fish with eggs in their testes show up in the Chesapeake Bay watershed -

Male bass switch sex - male fish with eggs in their testes show up in the Chesapeake Bay watershed - 



At first she was surprised. Then she was disturbed. Now she’s a little alarmed. Each time a different batch of male fish with eggs in their testes shows up in the Chesapeake Bay watershed, Vicki Blazer’s eyebrows arch a bit higher.

In the latest study, smallmouth bass and white sucker fish captured at 16 sites in the Delaware, Ohio and Susquehanna rivers in Pennsylvania had crossed over into a category called intersex, an organism with two genders.

“I did not expect to find it quite as widespread,” said Blazer, a U.S. Geological Survey biologist who studies fish. Since 2003, USGS scientists have discovered male smallmouth and largemouth bass with immature eggs in several areas of the Potomac River, including near the Blue Plains Advanced Wastewater Treatment Plant in the District.

The previous studies detected abnormal levels of compounds from chemicals such as herbicides and veterinary pharmaceuticals from farms, and from sewage system overflows near smallmouth-bass nesting areas in the Potomac.

Those endocrine-disrupting chemicals throw off functions that regulate hormones and the reproductive system. In the newest findings, at one polluted site in the Susquehanna near Hershey, Pa., 100 percent of male smallmouth bass that were sampled had eggs, Blazer said.

A magnification of a cross-section view of a smallmouth bass' testes that shows immature eggs, which are round circles on the monitor. 
With the mutant bass, she said, “we keep seeing . . . a correlation with the percent of agriculture in the watershed where we conduct a study.”

The fish that were dissected and analyzed by researchers swam downstream from farms and animal feed operations, where rains wash manure filled with various chemicals and hormones into streams and rivers.

It was a familiar finding. After the first intersex bass were found in the Potomac, the U.S. Fish and Wildlife Service made a remarkable discovery in follow-up research at Blue Plains: “We found female germ cells in the testes of 82 percent to 100 percent of the male smallmouth bass and in 23 percent of the males from . . . largemouth bass,” the agency said.

It is a problem that extends well beyond the Chesapeake Bay region, which includes the District, Virginia, Maryland, Delaware, West Virginia and Pennsylvania. Intersex bass were found by the USGS in the Columbia, Colorado and Mississippi river basins in 2009. Scientists have yet to identify a single chemical responsible for causing male fish to become part female.

In urban areas, estrogen products are often flushed down drains, contaminating water. In rural areas, natural animal hormones, much of it estrogen, is excreted in manure, which is spread on fields and washed into water by rain.

“I think it’s a complex mixture of chemicals,” said Blazer, who authored the study with nine researchers.

The findings published in Environmental Monitoring and Assessment coincided with a new report from the Environmental Integrity Project that says there is far more nitrogen and phosphorus pollution in the Chesapeake Bay than states and the Environmental Protection Agency have led residents to believe.

The report, “Murky Waters: More Accountability Needed for Agricultural Pollution in the Chesapeake Bay,” says monitoring of fertilizers and other chemicals used at farms, particularly large animal feed operations on Maryland’s Eastern Shore, is too lax under the bay cleanup plan that is being enforced by the EPA.

Read more -
http://www.washingtonpost.com/national/health-science/as-more-male-bass-switch-sex-a-strange-fish-story-expands/2014/08/03/89799b08-11ad-11e4-8936-26932bcfd6ed_story.html

Man-made 'breathing' leaf is an oxygen factory for space travel -

Man-made 'breathing' leaf is an oxygen factory for space travel - 



One of the persistent challenges of manned space exploration is that pesky lack of oxygen throughout much of the universe. Here on Earth, trees and other plant life do us a real solid by taking in our bad breath and changing it back to clean, sweet O2.

So what if we could take those biological oxygen factories into space with us, but without all the land, sun, water, soil, and gravity that forests tend to require? This is the point where NASA and Elon Musk should probably start paying attention.

Royal College of Art graduate Julian Melchiorri has created the first man-made, biologically functional leaf that takes in carbon dioxide, water, and light and releases oxygen. The leaf consists of chloroplasts -- the part of a plant cell where photosynthesis happens -- suspended in body made of silk protein.

"This material has an amazing property of stabilizing (the chloroplast) organelles," Melchiorri says in the video below. "As an outcome I have the first photosynthetic material that is living and breathing as a leaf does."

In addition to its potential value to space travel, Melchiorri also imagines the technology literally providing a breath of fresh air to indoor and outdoor spaces here on Earth. The facades of buildings and lampshades could be made to exhale fresh air with just a thin coating of the leaf material.

But perhaps best of all, a man-made breathing leaf could be the key to not just space travel but space colonization. No need to figure out how to till that dry, red Martian dirt to get some nice leafy trees to grow; we could just slap them on the inside of the colony's dome and puff away.



Read more- 
http://www.cnet.com/news/this-man-made-breathing-leaf-is-an-oxygen-factory-for-space-travel/