Scientists have developed a way to track fish using tags and satellite signals. The technology could help fishermen catch just the fish they want, when they want. This is largely about fishing and conservation - but there are also more serious aspects as well.
Demonstrations that eventually ousted the prime minister have cost lives, but the protest mood is not fading: many want every member of the storied Rajapaksa family out of government. We examine an effort to develop undersea GPS and learn why a watery sat-nav would be so useful. And why 1972 was such a formative year for music in Brazil.
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