Biology, for better or for worse, has been a study of snapshots, meaning that when I take a finger prick of my beta-hydroxybutyrate or when I take a finger prick of my glucose, you get a snapshot in time of what my metabolic state looks like, but what's actually happening is that there's a flux or a turnover of all these metabolic states happening all at the same time, and we just don't have the technical measurement tools to actually measure flux really easily.