Buoyancy  is an upward force exerted by a fluid, that opposes the weight of an immersed object. It was famously discovered by Archimedes in 232 BC while having a bath. He allegedly jumped out of the bath and ran through the streets in the buff shouting “Eureka!” (heúrēka “I have found (it)”). He thus became renowned for all time as the world’s first streaker.

I am a non swimmer. One evening twenty years ago I was showing off my punting skill in Oxford with a group of old schoolfriends after consuming far too much wine at a meadow picnic. The pole stuck fast in the river mud, and I held on too long.

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