... result of fermentation, but an amount we can tolerate (it's part of what gives you a hangover). When it is distilled, it becomes too concentrated for safe human consumption. Professional distillers know that methanol boils at 151F while ethanol boils at 173F. So, the _first_ thing that comes out of a still is mostly methanol, and you throw away the first half cup out of your still (or store it, carefully marked, for cleaning solvent) because it is a lethal poison. The remainder of what ...