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Have you ever thought about the little habits we have when using elevators every day? For instance, when you get in an elevator, do you press the floor number first or the 'close door' button? Most people press the floor number and then the 'close door' button. However, this approach actually has its drawbacks. The correct way is to press 'close door' first and then the floor number. Why is that? When you press the floor number first, the elevator system takes some time to process your request before starting to close the doors. On the other hand, if you press 'close door' first, the elevator system will start closing the doors immediately and then begin moving. This small difference might only save 1-3 seconds each time, but think about it, it's not insignificant when you accumulate that time over a year! What's your usual habit? Actually, this little trick doesn't just apply to using elevators, but there are many other details worth paying attention to. For example, when using vending machines, do you insert your card first or select the product first? When using public transportation, do you swipe your card first or find a seat first? These seemingly trivial things actually have many little tricks that can help us complete tasks more efficiently. So, next time you use an elevator, remember to press 'close door' before selecting your floor!