Free Thinking looks at today's world with "a pinch of salt" tonight. From stories in the bible to desalination plants, preserving food to salt taxes: how does salt help us think about the past and present? We use phrases like "being worth your salt" or "dropping salt" meaning to spread rumours. With food writer Bee Wilson, materials scientist Mark Miodownik, the novelist and writer on folklore Zoe Gilbert and artist David Soin Tappeser. Plus, especially salty guest Baga Chipz.

David Soin Tappeser, along with Himali Singh Soin, is one half of Hylozoic/Desires, whose exhibition Salt Cosmologies is at Somerset House in London until the 27th April.

Producer: Luke Mulhall