Every day you learn how to feel. Listen to people complain, and you'll start to do the same. Talk to someone who is depressed, and you'll feel depressed. But talk to someone who is happy and you too will feel good.

Don't you know someone who can light up the room with their smile? Or someone who can kill the mood without saying a word?

Imitating others is something you can't control. The social contagion thesis posits that attitudes, beliefs, moods and behaviour spread among people like infectious diseases - not by rational choice.

You'll be happier when you hang out with happy people and avoid pessimists.

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