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...working lightsabers in real life? Surely physicists must be smart enough (and big enough Star Wars fans) to be able to produce one of these incredible objects. The obvious way of building a lightsaber would be to use a laser, which can be seen as a particularly bright and directional burst of light. But even though laser technology is continuously striding towards more...

...works. For dogs, interesting and useful features are identified and, because they are determined genetically, they can be bred by selective breeding (i.e. choosing animals with features you want and breeding them to create new offspring with those features). We have bred dogs with regard to developing better functional capabilities (running, hunting, digging, burrowing,...