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Holes through a PCB are typically drilled with small-diameter drill bits made of solid coated tungsten carbide. Coated tungsten carbide is recommended since many board materials are very abrasive and drilling must be high RPM and high feed to be cost effective. Drill bits must also remain sharp so as not to mar or tear the traces. Drilling with high-speed-steel is simply not feasible since the drill bits will dull quickly and thus tear the copper and ruin the boards. The drilling is performed by automated drilling machines with placement controlled by a drill tape or drill file. These computer-generated files are also called numerically controlled drill (NCD) files or "Excellon files". The drill file describes the location and size of each drilled hole.

What property do PCBs have that makes them tough to drill through?
Answer: abrasive
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Filming started in Austria in December 2014, with production taking in the area around Sölden—including the Ötztal Glacier Road, Rettenbach glacier and the adjacent ski resort and cable car station—and Obertilliach and Lake Altaussee, before concluding in February 2015. Scenes filmed in Austria centred on the Ice Q Restaurant, standing in for the fictional Hoffler Klinik, a private medical clinic in the Austrian Alps. Filming included an action scene featuring a Land Rover Defender Bigfoot and a Range Rover Sport. Production was temporarily halted first by an injury to Craig, who sprained his knee whilst shooting a fight scene, and later by an accident involving a filming vehicle that saw three crew members injured, at least one of them seriously.

What part of his body did Craig injure?
Answer: knee
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Evidence suggests big-game hunter gatherers crossed the Bering Strait from Asia (Eurasia) into North America over a land bridge (Beringia), that existed between 47,000–14,000 years ago. Around 18,500-15,500 years ago, these hunter-gatherers are believed to have followed herds of now-extinct Pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific coast to South America.

What other way could they have crossed on to this continent?
Answer:
primitive boats