Philosophically, what is "time"? Even if we don’t completely understand what time is, we can precisely measure what time it is, thanks to the atomic clock, humankind’s most accurate measurement device. Atomic clocks have revolutionized navigation. Only time will tell us its future applications.
In their second suspenseful adventure, the League of SI Superheroes battles archvillain Major Uncertainty in a race to keep the world's satellite navigation system "on time".