A geek example.
The credit card we know and love depends (or used to depending where you live) on magnetic film fixed to plastic. Forrest Parry, an IBM engineer, thought of the idea but he couldn't make it work. Nothing would stick one to the other.
Eventually fed up, he came home with several pieces of magnetic tape and cards. His wife Dorothea who was ironing wanted to get to her favourite programme on tv quickly thought of how to attach them: "Here, let me try the iron." She did and the problem was solved.
Iron heat was just enough to fix tape to card.
Thanks to Channel R for the use of this graphic.
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