10 Places on Earth Where Time Runs Differently

6. Boulder, Colorado (USA)

In Boulder, Colorado, time runs about 10 nanoseconds faster each year compared to sea level. Scientists at the U.S. National Institute of Standards and Technology (NIST) showed that even a 30 cm height difference causes small shifts in time using atomic clocks.

Their precise tools detect these tiny changes. Visiting Boulder means being in the city where time is measured down to billionths of a second.