Forget the cookie-cutter Valentine's Day greetings and the cheesy rom-com clichés. When it comes to lessons on love, we'd rather look to those who have dedicated their lives to the ultimate form of love -- love of humanity. From political leaders to anti-nuclear activists to literary heroes, these 10 changemakers have led lives worth emulating. So whether you are spending a romantic evening with your plus one or enjoying a night of take-out and Netflix solo, at least one of these truth-tellers is sure to inspire you.