I have just been offered a 6 month geochronology contract with Geoscience Australia. The aim is to help them work through their backlog of U/Pb ion probe zircon dating. The contract says that a security clearance is required. Now, I don’t know what state secrets these mineral grains hold, or how bombarding them with 10KeV O2- ions will reveal this information, much less endanger the operations of the Australian government. But you won’t find out from me. Loose lips sink ships. And they wreak havoc on high vacuum systems when you try to pump them down. So mine are sealed.