Was making an omelette and got eggshell shards in the mix. I automatically used the broken shell to retrieve them, as they are drawn to the shell (but retreat from a teaspoon). This excellent tip, which I use probably once a week, comes from an old uni friend (whom it pleasantly brings to mind) and must date back to the 1980s. So many thanks to my dentist student flatmate, whom I've not seen for some years!
Anyone else got any trusted (cooking or other) tips that have stood the test of time?