Gregory Staradub, MIT asked:
I sometimes brew my own beer. When I open a bottle of beer that Iíve brewed, sometimes it behaves nicely and fizzes up all over the place but this doesnít seem to be correlated with how long the beer has spent in the bottle. Since I reuse the bottles Iím wondering, therefore, if some bacteria have got into the beer and they keep fermenting it in the bottle. Does this theory make sense and what other explanations might there be?
We put this question to Charlie Bamforth, Professor of Beer and Brewing at the University of California at Davis. You can hear the whole interview here.