In British English—or, as the British say, "English"—"learned" is used in phrases such as "a learned professor", in which case it is pronounced with two syllables.
Either "learnt" or "learned" are used interchangably in phrases like "I learnt a valuable lesson today".
I'd hate to think that the sole litmus test for any scientific endeavor would become "is there any money in it".
Artificial intelligence has the same relation to intelligence as artificial flowers have to flowers. -- David Parnas