Excerpt: How does it happen? Two people, never having met before, end up feeling like they've known each other for years. Almost like love at first sight. Fortunately, Maxis has captured this aspect of life and inserted into the game by giving Sims chemistry. This chemistry takes the form of lightning bolts that appear with the other Sim's picture in the relationship panel. The more lightning bolts the more chemistry and attraction both Sims have toward each other.