For Valentine's Day, NBC Learn takes a look at the chemistry of chocolate, explaining why the treat is so irresistible thanks in part to its ideal melting temperature and mood-lifting compounds.

When Hiro commands Baymax to fight, something it doesn't understand, the cute medical care robot instead tilts his head and tenderly asks what would improve Hiro's mood, melting the audience's hearts.

Sometimes, you are in the mood for a relaxed drink in a softly-lit lounge and other times, for a face-melting guitar solo by one of China's up and coming rock bands.