Where's me soldiers?

Certain things that you do can be undone - that is to say everything involved can be put back into its original state.  These are called reversible processes.  Of course if you have reversible processes then they wouldn't be called that unless you also had irreversible processes - things that can't be undone. An example often given of the latter is a boiled egg - you can't unboil it.  Except it now appears you can - well, sort of.  Scientists in America have found a way of turning hard-boiled white of egg back into something like its original liquid state.  Not really unboiling it perhaps but apparently the technique may have useful ramifications in other areas.