Rewriting the checklists: 50 years since Apollo 13 reported it 'had a problem' – and boffins saved the day

It's instrumentation. It must be instrumentation. It wasn't instrumentation. Final part of The Register's look at Apollo 13

Part two 55 hours, 52 minutes and 58 seconds into Apollo 13's mission, capsule communicator Charlie Duke asked the crew to stir the spacecraft's cryo tanks. Command Module Pilot Jack Swigert did so, and the "boring" mission became suddenly all too interesting."