Sound Ledger¹ (Triassic, Mars, Whales)

Audio culture by the numbers

240,000,000: Estimated number of years since when male katydids have made sounds by rubbing their wings

60: Number of dust grain impacts per second recorded by the Mars rover

30: The percent that the measured frequency of whale songs has declined over the past four decades


Katydid: Mars: Whales:

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