The famous canals of Venice have been looking clearer since Italy went on lockdown to slow the coronavirus pandemic. From CNN:
“The water now looks clearer because there is less traffic on the canals, allowing the sediment to stay at the bottom,” a spokesman said.
“It’s because there is less boat traffic that usually brings sediment to the top of the water’s surface.”
From Nicholas LePan, Visualizing the History of Pandemics.
The practice of quarantine began during the 14th century, in an effort to protect coastal cities from plague epidemics. Cautious port authorities required ships arriving in Venice from infected ports to sit at anchor for 40 days before landing — the origin of the word quarantine from the Italian “quaranta giorni”, or 40 days.
A great video to help friends and family understand why these huge, early measures are necessary to stop the pandemic.