Just 50 years after Johannes Gutenberg invented his printing press in the mid-15th century, more than 6 million books had been published on law, science, poetry, politics, and religion.
There are 142,000 recognized species of moths, and scientists estmate that there are thousands more yet to be discovered.
The state of Michigan claims more varieties of trees than all of Europe, which are spread over 19 million forested acres — more than half the state.
The American crow weighs approximately one pound when fully grown.
Of all the potatoes grown in the United States, only 8 percent are used to make potato chips. Special varieties referred to as "chipping potatoes" are grown for this purpose.
Pennsylvania has the largest rural population in the United States.
After 94 years of construction, the Mexico Cathedral was completed in 1667.