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<p>Evolution of a spin and its uncertainty as they orbit due to a magnetic field</p>

<p>Courtesy of: ICFO</p>
Scientists Evade The Heisenberg Uncertainty Principle
The study, published in Nature, reports a technique to bypass the Heisenberg uncertainty principle.
<p>Image courtesy of NCSU</p>
Using Light to Control Curvature of Plastics
Researchers have developed a technique that uses light to get two-dimensional (2-D) plastic sheets to curve into three-dimensional (3-D) structures, such as spheres, tubes or bowls.

<p>This spectacular image from the VLT Survey Telescope shows the Cat’s Paw Nebula (NGC 6334, upper right) and the Lobster Nebula (NGC 6357, lower left). These dramatic objects are regions of active star formation where the hot young stars are causing the surrounding hydrogen gas to glow red. The very rich field of view also includes dark clouds of dust. With around two billion pixels this is one of the largest images ever released by ESO. A zoomable version of this giant image is available here.</p>

<p>Note that the circular features in the image around bright stars are not real, they are due to reflections within the optics of the telescope and camera.</p>


The Cat’s Paw and Lobster Nebulae
The beautiful, glowing, cosmic clouds of gas and dust catalogued as NGC 6334 and NGC 6357 now have new names.
<p>3-D visualization of chemically-ordered phases in an iron-platinum (FePt) nanoparticle. Using the Titan supercomputer at the Oak Ridge Leadership Computing Facility, researchers from Oak Ridge National Laboratory simulated the magnetic properties of strongly magnetic phases in the FePt nanoparticle using the precise 3-D atomistic structure obtained by researchers at University of California, Los Angeles and Lawrence Berkeley National Laboratory (Berkeley Lab). Video credit to Colin Ophus, Berkeley Lab. Video courtesy of Nature.</p>
First Look at Magnetism of Real Nanoparticle
Scientist help solve a unique problem: to model magnetism at the atomic level using experimental data from a real nanoparticle.

Dark Matter May be Smoother than Expected
Analysis of a giant new galaxy survey suggests that dark matter may be less dense and more smoothly distributed throughout space than previously thought.
Holograms from Neutrons Created
For the first time, scientists have used neutron beams to create holograms of large solid objects, revealing details about their interiors in ways that ordinary laser light-based visual holograms cannot.
Oldest Known Planet-Forming Disk Found
Scientists find a star surrounded by the oldest known circumstellar disk—a primordial ring of gas and dust that orbits around a young star and from which planets can form.

Science Facts

Aerosol Sprays

by Richard M. J. Renneboog and

: Image Courtesy EPA Liquid forced through a small orifice under pressure will come out Is a spray of fine droplets, or mist, rather than as a stream, or jet. A 'squirt gun' works the same way, as does the kitchen faucet when you turn on the tap. How come the water from them comes out in a stream instead of as a spray? An interesting question that tells there is more going on in fluid dynamics than meets the eye! The physical properties of liquids play a fundamental role. For water-based solutions in particular the properties of viscosity, surface tension, and molecular adhesion play very significant roles in the formation of an aerosol spray. As liquid begins to move inside of a tube, all of the component materials move equally and smoothly, and without turbulence. Picture the entire mass just sliding through the tube. This is called 'laminar flow'.

Materials in contact with the sides of this conduit, however, do not move as freely as do the materials in the middle of the tube. Through molecular adhesion, they experience friction by 'sticking' somewhat to the hose or pipe material. This tends to make the outermost materials move more slowly than the materials in the center of the tube, and that introduces turbulence into the flow. The faster the material moves through the tube, the greater the turbulence that is introduced. As the liquid leaves the tube, as through a faucet or a nozzle, surface tension comes into play, tending to separate the liquid stream into a line of small, round blobs. This is especially true for water, which possesses a very high surface tension. The effect is very easy to see if you just watch a smooth, single stream of water change, and break up into spherical segments. Surface tension continues to act on these bits, breaking them up into even smaller spherical bits until they hit the ground.

To make a fluid move faster through a tube, one must increase the pressure applied to it. As the liquid moves faster, the turbulence increases and it more readily separates into smaller and smaller drops. Each hole has a characteristic threshold pressure determined by its size and shape: below that pressure, the liquid stream maintains its integrity and exits as a stream. At pressures above the threshold pressure, turbulence wins and the stream exits as drops whose size is inversely related to the applied pressure. An aerosol spray can is a self-contained pressure spraying system that uses a quantity of pressurized gas to push out the liquid. Once the valve is open, the pressurized gas pushes the liquid up the tube, through the valve, and out through the small round hole of the spray nozzle. At this point, the effects of liquid flow, turbulence, pressure, and nozzle size all combine to produce a mist pattern of fine droplets.


The small and rocky planet Mercury is the closest planet to the Sun; it speeds around the Sun in a wildly elliptical (non-circular) orbit that takes it as close as 47 million km and as far as 70 milli ...
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Front page of the William Gilbert
Earth's Magnetism

Most ancient civilizations were aware of the magnetic phenomenon. Sailors in the late thirteenth century used magnetized needles floating in water as primitive compasses to find their way on the sea. ...
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This image shows the comet Wild 2, which NASA
NASA Spacecraft Reveals Surprising Anatomy Of A Comet

Findings from a historic encounter between NASA's Stardust spacecraft and a comet have revealed a much stranger world than previously believed. The comet's rigid surface, dotted with towering pinnacle ...
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