 They lose half their life every 109 minutes. So there's a cyclotron manufacturer in Seattle. They've got to make them. They've got to get them to the airport, and they've got to get them ahead in a little time. They've got to get on a plane, and then they've got to get to Fairbanks. And every 109 minutes, those isotopes lose half of their life. So as an example, if we wanted to give five doses in Fairbanks,