HardNature
I am lighter than a feather yet I carry millions of tonnes. I have no shape yet I take every shape. I float even though I am enormously heavy. What am I?
Answer: The Clock / Standardised Time. Before standardised time, each town kept its own local time based on the sun. Railways made this chaotic — timetables were impossible. Railway companies drove the creation of standardised time zones, eventually leading to the global time system we use today.