Graphite is one of many allotropes of carbon, typically found in igneous and metamorphic rocks, and forms as a result of contact or regional metamorphism. - Link
NPR's Skunk Bear posted a nice concise video on why we use graphite, what it is, and why it works. The weak Van der Waals forces between sheets of carbon allows the sheets to "slide" past one another and onto a piece of paper. Graphite is one of many allotropes of carbon, typically found in igneous and metamorphic rocks, and forms as a result of contact or regional metamorphism. - Link Wint-o-Green mint Life Savers seem to be the only flavor that exhibits triboluminescence; breaking or deformation of chemical bonds causes an ionization of air and a subsequent discharge of light. It can be hard to see when you're chewing them (using a mirror and sitting in the dark), but it also works if you hit them with a hammer. "The survey, which covered a representative sample of 1,500 middle and high school science teachers from all 50 states, found that classrooms often suffer from a problem also common in the media: the false "balance" of giving equal weight to mainstream climate science and climate change denial."
Link to original article here. (*bangs head on teacher desk repeatedly*) How cool is this? Instead of using mass spectrometry to measure the mass of large numbers of ionized molecules, scientists at Caltech have invented a device (shown above under a scanning electron microscope) that can measure the mass of ONE MOLECULE. Directly. The "nanoelectromechanical system resonator" is only 2 microns in length, and uses vibrational frequencies to identify the mass of a molecule that lands on it. - LINK
|
Who is Riss?
Alan Rissberger "No one warned me that life would involve science, except my science teacher. But, of course, he's going to say that. He's got a job to protect."
- Stephen Colbert, I Am America (And So Can You) Wish List
Paper towels!
Tissues! BandAids! Archives
September 2017
News/BlogsAll-Geo
Business Week Discover Magazine Ecologist.org E - The Environmental Magazine Environmental News Network Environment News Service Geek.com Green Magazine The Guardian Highly Allochthonous Information is Beautiful NASA Goddard Institute NASA News National Geographic National Science Foundation OnEarth Reuters Science Science Daily Scientific American Smithsonian Magazine WUNC NPR News WUNC The State of Things xkcd Categories
All
|