Today's lunch-time nerdsnipe:
In 1852, Jean-Baptiste Boussingault discovered by experimentation that bread does not go stale because of a net loss of moisture (by means of hermetic sealing), and further observed that bread could be un-staled by putting it in the oven at a modest temperature.
He published his work in the paper "Expériences ayant pour but de déterminer la cause de la transformation du pain tendre en pain rassis" and despite the fact that I DON'T READ FRENCH I have made an attempt to track down a digital copy.
Alas, it appears that this particular article has never been digitized.