There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of CD, DVD and software packaging, as well as just about everything sold as "official merchandise...
Walk into almost any business office, and you'll probably find a photocopier ("copier") with a line of people waiting to use it. For most businesses, small or large, the copier has become standard equipment, much like having a desk to work at and a chair to sit in. What if you had...
You must have hadsqrt(x**2+y**2)and then setyto zero. But withyset to zero we're down to 1D Hooke's law in which case the proper expression for the force should be linear. So what we really want here is to end up withxrather thanabs(x). My point here is not that there w...
Edward Farhi, an MIT physicist who researched strangelets, thinks the most likely place to find strange matter is in neutron stars. These collapsing stars compress their interiors forcefully. "At the core, you have densities and pressures large enough to form strange matter. If strange matter for...
Find a drinking straw or an old pen (remove the ink tube). Also find a small nail (or a straightened paper clip) that will slide inside the tube easily. Wrap 100 turns of wire around the tube. Place the nail or paper clip at one end of the coil and then connect the coil to the...
Nearly all of our cellshave the ability to generate electricity. And in this article, we'll look at the role of electricity in the human body and find out how we produce it in the first place. The starting point is simple: Right now, any cells in your body that aren't actively sendi...
How does the funny "H" pattern that I am moving this stick shift knob through have any relation to the gears inside the transmission? What is moving inside the transmission when I move the shifter? When I mess up and hear that horrible grinding sound, what is actually grinding? What ...
Force elicits TCR catch-slip bonds with strong pMHCs but slip-only bonds with weak pMHCs. We develop two models and apply them to analyze 55 datasets, demonstrating the models’ ability to quantitatively integrate and classify a broad range of bond behaviors and biological activities. Comparing ...
Once the body part to be scanned is in the exact center, or isocenter, of the magnetic field, the scan can begin. What goes on during a scan? Find out next. MRI Developments MRI machines are evolving so that they're more patient-friendly. For example, many claustrophobic people simply ...
These allow us to predict intrinsic spin lifetimes as an upper bound for experiments, identify the dominant spin relaxation pathways, and evaluate the dependence on temperature, external fields, carrier density, and impurities. We find that the Fröhlich interaction that dominates carrier relaxation ...