China's 24 Solar Terms, the ancient Chinese knowledge of dividing a year through the observation of the sun's annual motion, was inscribed on the World Intangible Cultural Heritage List in 2016.
Dara Ó Briain explores Earth's vital relationship with the sun, from how it was formed and where its ferocious power originates to sun-worship and monuments such as Stonehenge.
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.