One pound of uncooked long grain rice contains more than 29,000 grains. In the U.S., rice is sold in bags of 2, 5, 10 and 50 pounds.
Rice has more than 40,000 species, though only a few varieties are marketed for sale. Thailand, India, the United States and Vietnam have the highest rice exports in the world. As much as 85 percent of rice eaten in the United States is grown in America, and nearly half of rice grown in the United States is exported to other countries.
In terms of cooking, rice swells to three times its original volume. The grain is a symbol of fertility and is traditionally thrown at weddings.