Ever wondered how people knew it was lunchtime before smartphones and smartwatches? Journey from giant pointy rocks to vibrating crystals in this whirlwind tour of timekeeping.

In this episode of BrainBlast, hosts Alex and Jordan trace the fascinating evolution of how humanity has measured its most precious resource: time. We explore the clever (and sometimes messy) inventions of the past, including:

• Ancient Innovations: How the Egyptians used sundials and the Greeks engineered "water thieves" known as clepsydras.
• Fire & Ice: The challenges of winter freezes and the "lit" invention of candle clocks used in ancient China and medieval Europe.
• The Mechanical Revolution: The 13th- ...