... shorter-necked, large-headed plesiosaurs, a group called the pliosauromorphs,were built for high-speed pursuits on the open ocean. The longer-necked, small-headed ple-siosauromorphs, on the other hand, ... and his co-workers at the Universi-ty of Texas at Austin disputed the basic the- ory of negative index materials. They point-ed out that modulation wave fronts (such asthose in the front of ... smallimprovements, but by the mid-1920s the sys-tems had become reliable and, with the emer-gence of oil-fired furnaces, more convenient.Natural gas, which became widely avail-able with the building of...