2025-0119u-0719 Austin, TX For the last week, I have been curious about the history of the 7-day week. This led me to a curiosity around the sexagesimal (base-60) number system developed by the Sumerians over five thousand years ago. The earliest evidence of counting is the clay tokens made in standardized shapes over seven thousand … Continue reading 2025 Day 19: Why is 19 sacred?