Think in terms of nurturing your own enthusiasm about life rather than nurturing their enthusiasm. Don't jump up and down about George Washington if he puts you to sleep. Be honest in your pursuit of what interests you. Let them see that you think something is really cool. Not to get them interested in something you think would be good for them but an honest "Wow! I love this stuff!" And ask questions about life. Be curious. Because it's the questions that are important. Anyone can look up the answers but not everyone can ask the questions.
(includes a link to a French translation)
photo by Marin Holmes