You have collected blood samples from a clinical study. The patient’s samples are taken to a laboratory and put in a freezer at −80 °C. When all samples are collected, they are to be analyzed. The study has been going on for 4 months.
One day when you are in the laboratory dropping off your samples, you notice painters at work in one part of the laboratory. You find out that they are going to paint the whole laboratory that week from Monday to Friday. The laboratory is very big with benches, shelves, a lot of electrical equipment, and of course several freezers.