Ninjas used a system called Goshiki-mai, meaning Five Colored Rice, in which rice grains were painted red, blue, yellow, black or purple in order to leave coded messages or trails.
Fact: On August 6, 1945, the U.S. dropped an atomic bomb on Hiroshima, Japan, killing over 140,000 people by the end of the year. This was a key event leading to the end of World War II.
