Tracks in example sentence
Last year, I spoke with a researcher named Matthew Killingsworth who is doing a very, very imaginative project that tracks people's happiness, and here is what he told me he found: "Interacting with your friends is better than interacting with your spouse, which is better than interacting with other relatives, which is better than interacting with acquaintances, which is better than interacting with parents, which is better than interacting with children.