The side of our new box of Trader Joe's Frosted Shredded bite size Wheats says: "Did you know? In the year 2700 BC, a Chinese emperor declared wheat one of the five sacred grains Today, it continues to be one of the world's most important food staples."
We took this as a riddle: name the five ancient Chinese grains. Besides wheat we knew rice, millet, and barley. We racked our brains. We googled.
The fifth grain is soybeans. Gotcha!