a very useful instrument the. inventor talents of a designer who revolutionized the fashion world with the mini skirts. we kick off today show on a sour note with sourdough bread that is it's the oldest and most original form of leavened bread now making the dough is quite simple all you have to do is combine flour water in a glass or plastic container cover it with a breathable lid then let it sit in a warm place for at least twelve hours and while you have the ingredients for a good loaf of sourdough bread while in belgium one specialist has created a library of sourdough starter let's find out now why he has cultivated this unusual passion. these jars filled with sourdough starter aren't just sitting in any old fridge they're exhibits on display at the parata sourdough library in belgium and they're all alive four degrees