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TIL since sound can travel through water better than it can air, the potential number of decibels is greatly increased. LFA Sonar used by ships and submarines is the loudest man made noise, reaching 200+ decibels. Marine biologists believe that sea creatures may beach themselves to escape the noise.

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oRADR TIL that the 4th Earl of Sandwich, for whom the sandwich was named, served as Britain’s First Lord of the Admiralty during the American Revolution. His poor leadership contributed to the American victory, and it was said that "Seldom has any man held so many offices and accomplished so little."
N7jY1 TIL the Romans not only built aqueducts and other wonders, but a large amount of dams. In Spain alone they built 72, and many of their dams in Europe are still in use to this day. They were mostly used for irrigation, but one example shows they dried up water in order to find gold deposits.
W74YN TIL Black english is considered as a separate dialect called AAVE. It has survived several attempts of elimination from educators before being recognized as a variation of english and having its own grammar
6EPRl TIL Animal rescue organisations in the US are placing "unadoptable" cats with businesses as natural pest control. In many cases, this positive socialization leads to the cats becoming affectionate permanent employees of the companies.
K1EQ TIL that in 1997, a group of enthousiasts began building a castle in France, using only materials, tools and techniques available in the 13th century (800 years ago). The project is scheduled to be completed sometime in the 2020’s.