Three-dimensional magnetic focusing of cold atoms with a single magnetic impulse has been observed for the first time. We load 7×10 Rb atoms into a magneto-optical trap, precool the atoms with optical molasses, then use moving molasses to launch them vertically through 20.5 cm to the apex of flight. In transit the atoms are optically pumped, prior to the single magnetic lens impulse that occurs...

We report the direct observation of motion associated with a solar are at a speed of 26000 km s ?1. The motion is seen from a radio source at 0.33 GHz, which suddenly starts moving during the are. At its peak the radio source covers a quiet region of dimension 500 00. Emission from any given location is sporadic. The disturbance itself does not seem to radiate, but it excites coronal features w...

The forcibly launched spores of ascomycete fungi must eject through several millimeters of nearly still air surrounding fruiting bodies to reach dispersive air flows. Because of their microscopic size, spores experience great fluid drag, and although this drag can aid transport by slowing sedimentation out of dispersive air flows, it also causes spores to decelerate rapidly after launch. We hyp...