Hi all, a couple of sunday morning ponderings for you if I may.

once you have broken the seal on a packet of cheese, it generally goes
off in a few weeks, whereas butter will last months (maybe a year) in
the fridge before it's inedible. but they're both made of basically the
same thing. how does this work?

also, milk lasts even less long than either butter or cheese - how
come?

Andy