What skills take less than 5 minutes to learn that everyone should know how to do?

The military alphabet, also known as the NATO phonetic alphabet, is incredibly important to learn. You have probably heard it countless times when someone is trying to spell out something like a name, number plate, or code. Instead of struggling to decipher letters, knowing the military alphabet makes communication much clearer. Despite its usefulness, it is surprising how few people are familiar with it.