Of the roughly 250,000 known marine species, scientists think all ~126 marine mammals emit sounds – the ‘thwop’, ‘muah’, and ‘boop’s of a humpback whale, for example, or the boing of a minke whale.

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At the newly reopened Bukit Batok Library, sounds of nature are helping readers to block out distractions of city life and focus on reading. It is also piloting new technology to help visitors ...