What did the ancients do with popcorn?

Popcorn was used by ancient people to make:

1, used by the ancients for divination. The legend of the dragon head festival and popcorn. The dragon head festival originated from the times. On the second day of February every year, Fuxi "attaches great importance to farming and mulberry cultivation" and "sends meals to the mother and cultivates the fields". Later, the Yellow Emperor, Tang Yao, Yu Shun and Yu Xia all followed Fuxi's example.

When I arrive in Zhou Wuwang, every year on the second day of February, a grand ceremony will be held to call on all civil and military officials to work together. On February 2 nd, there was a saying that "attracting dragons to smoke insects" in order to drive away drugs and avoid epidemics.