In ancient times watchman would mount the city walls in times of stress to survey the scene outside the fortifications. He was situated on a spot from which he could monitor the approaches to the town. If a threat appeared, he would sound a warning and the town would shut its gates and prepare for battle.
Next month, the US Food and Drug Administration will hold a two-day public
meeting to discuss genetic modification within the human egg, which changes
will be passed on generationally.
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