From 1000 BCE, most of Central America used similar types of calendars based on material objects and celestial constellations ... This created a sort of permanent fortune-telling machine and guided ...

As the clocks go forward this spring, see if you can solve these puzzles based on ancient calendars ... sign up for The Essential List newsletter – a handpicked selection of features, videos ...

Jessica Bloom and Bianca Nogrady stand in for Dr Karl. They discuss astrophysics, quantum effects, the Higgs Field and ancient calendars.