No se pero 20$ son 20$
#29 https://www.cbsnews.com/news/scientist-bakes-sourdough-bread-with-4500-year-old-yeast-found-in-egyptian-pottery/
mirare lo de ria que habeis dicho un par
#34 me sale mas barata y es mas fiable que tu https://www.ebay.es/itm/165468357102?itmmeta=01HQ0PK6GTWZ8JP1PXVTCAT97X