Whaling may have started 1,500 years earlier than already known
Specialized whale-bone harpoons from southern Brazil dating back 5,000 years suggest that Indigenous groups in the area were whalers.
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Specialized whale-bone harpoons from southern Brazil dating back 5,000 years suggest that Indigenous groups in the area were whalers.
As the threat of falling spacecraft increases, using earthquake sensors to detect the effects of their sonic booms could better map trajectories.