Breathingearth - CO2, birth & death rates by country, simulated real-time Going with the Flow Measuring local blood flow inside living creatures provides insight into both normal functions and diseases. Ultrasound can probe deep within tissues by using the Doppler shift of the sound waves’ frequency to detect the motion of blood cells. But this effect is unmeasurable for blood moving slower than about ten millimeters per second. In Physical Review Letters, Lidai Wang and his colleagues at Washington University, Missouri, demonstrate that ultrasonic waves can instead be used to heat a small volume of blood, thereby “tagging” it. The motion of this tagged blood is then tracked by a light-based technique. In a test setup, they measured speeds as low as a quarter of a millimeter per second. To track the motion of the tagged blood, the researchers exploited the photoacoustic effect, in which absorption of an infrared light pulse locally expands a material, generating sound waves.
Damn Interesting • A collection of Damn Interesting things Gapminder: Unveiling the beauty of statistics for a fact based world view. - Gapminder.org 10 Websites To Make You Think | The Online Learning Blog from Study2U Supposedly browsing the internet requires more brain power than watching television. Although judging from some of the websites we’ve come across that assumption is cast into doubt. Here’s some of the sites we like that might get your brain to sit up and listen. Ted A conference that started in 1984 bringing together experts in technology, entertainment and design quickly grew into so much more. New Scientist The New Scientist website carries new articles from the magazine as well as the NS archive of over 76,000 pieces. Big Think The Big Think website is a collection of ‘global thought leaders’ who offer their thoughts and analysis on world events and other important developments. Café Scientifque ‘for the price of a cup of coffee or a glass of wine, anyone can come to explore the latest ideas in science and technology’ Breathing Earth This fantastic website by David Bleja demonstrates CO2 emissions and world population growth in real time on a global map. Arts & Letters Daily How Stuff Works
icists 'uncollapse' a partially collapsed qubit (Phys.org) —One of the striking features of a qubit is that, unlike a classical bit, it can be in two states at the same time. That is, until a measurement is made on the qubit, causing it to collapse into a single state. This measurement process and the resulting collapse may at first seem irreversible. (Once you open the box to find a dead cat, there's no going back, right?) In a new paper published in Physical Review Letters, physicists J. As the physicists explain, a full collapse of a qubit results from a measurement that reveals the qubit's state, while a partial collapse results from a measurement that can be thought of as a "peek" at the qubit because it doesn't reveal the qubit's state, but simply verifies that the qubit hasn't decayed. The concept of a partial collapse can also be imagined in terms of Schrödinger's cat. "To really torture the cat analogy, imagine the cat could be in three states: happy, sad, or dead," Sherman told Phys.org. More information: J.
100 Best Science Documentaries Online No matter how much you know, there is always something new to learn about science. While your college courses may cover the basics, you can get a more in-depth look at a wide variety of topics from Internet resources such as these great documentaries. These selections will help you explore everything from the inner reaches of the human mind to the outer areas of our universe and just about everything else in between. Better yet, they’re all free to watch online so you can learn more without spending a dime. Health and Medicine These documentaries cover topics like health care, diseases, nutrition, nursing, and more so you can get great insights into health and medicine. Super Size Me: In this movie, filmmaker Morgan Spurlock attempts to subsist on only a diet of McDonald’s for a full month. Drugs Learn how drugs impact the brain and the variety of legal restrictions imposed upon them from these documentaries. Genetics Evolution and Biological History Physics The Quantum Revolution: Dr. Geology
Watch Free Documentaries Online | Documentary Heaven Khan Academy cambridgeinstruments.com 125 Great Science Videos: From Astronomy to Physics & Psychology Astronomy & Space Travel A Brief, Wondrous Tour of Earth (From Outer Space) - Video - Recorded from August to October, 2011 at the International Space Station, this HD footage offers a brilliant tour of our planet and stunning views of the aurora borealis.A Universe from Nothing - Video - In 53 minutes, theoretical physicist Lawrence Krauss answers some big enchilada questions, including how the universe came from nothing.A Year of the Moon in 2.5 Minutes - Video - The Lunar Reconnaissance Orbiter has been orbiting the moon for over a year. The footage gets compressed into 2 slick minutes.A Day on Earth (as Seen From Space) - Video - Astronaut Don Pettit trained his camera on planet Earth, took a photo once every 15 seconds, and then created a brilliant time-lapse film.Atlantis's Final Landing at Kennedy Space Center - Video - After more than 30 years, the space shuttle era comes to a close. Video runs 30 minutes. Physics Biology & Chemistry Environment, Geology and & Ecology