caisson bridge support underwater workspace

A caisson creates a dry place to work underwater

A caisson is a large hollow structure used for construction underwater. It can be lowered to the bottom of a river or other body of water and keep water away from the work area, allowing people to build things such as bridge supports.

Coal use is estimated to cause 800,000 premature deaths a year

~800,000 premature deaths/year

Coal use is estimated to cause about 800,000 premature deaths worldwide each year, with most occurring in India and China.

British ketchup was once made from mushrooms

In 17th-century Britain, ketchup was made mainly from mushrooms. Early recipes could also use ingredients such as oysters, mussels, grapes, or walnuts.

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caisson bridge support underwater workspace

A caisson creates a dry place to work underwater

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