Life is precious, and time is short.

The best engineer cannot create more time, and the best scientist cannot invent more time. We all have the exact same amount of time — 24 hours a day, 168 hours every week, 86,400 seconds every day. Once it's gone, you can't get it back. You cannot accumulate time or borrow tomorrow's time. Since it feels like we have plenty of time left, we take for granted our 86,400 seconds every day.