Let the words speak for themselves | Brief letters

Bubbles in beer | Female newsreaders | Yellow highlighter | Pesto as a staple food | First swallowsGive yeast to provide bubbles in beer (Letters, 13 April)? That means reduced alcohol content in the brew, a balance restored circa 1794 by the head brewer, Joseph Crabtree, of the Gordon & Hume Brewery in Edinburgh’s Grassmarket, who discovered that adding additional fermentable sugars suppressed oxidation to gas and retained alcohol content (the Crabtree Effect). However, this increases