Sometimes, people have life problems that can be entirely solved by doing one thing. (doing X made my life 0.1% better, PERMANENTLY!) These are not things like "This TAP made me exercise more frequently", but rather like "moving my scale into my doorway made me weigh myself more, causing me to exercise more frequently" - a one-shot solution that makes a reasonable amount of progress in solving a problem.
I've found that I've had a couple of life problems that I couldn't solve because I didn't know what the solution was, not because it was hard to solve - once I thought of the solution, implementation was not that difficult. I'm looking to collect various one-shot solutions to problems to expand my solution space, as well as potentially find solutions to problems that I didn't realize I had.
Please only put one problem-solution pair per answer.
A friend tells me that they would have a new cold sore every ~3 weeks during winter months. After reading this paper: https://proceedings.med.ucla.edu/wp-content/uploads/2016/03/A151218DG-WH-edited.pdf they told the local pharmacist that they needed the chickenpox vaccine since they never had it as a child (which was a lie). Since then (about 3 years), they have only had one cold sore which was much milder than the previously typical ones.
As a side note: it seems to me like it would be worth trying this as a pre-exposure prophylactic for genital herpes if you have sex with multiple people.