Forty is the only number that is spelled with its letters in alphabetical order.

Half of the world’s geysers are located in Yellowstone National Park.

During a launch, the solid rocket boosters on the Space Shuttle consumed 11,000 pounds of fuel per second.

On the U.S. tone and grade designation scale, the number assigned to pencils (No. 2, No. 3, etc.) refer to the hardness of the graphite “lead” in the pencil; the lower the number, the softer the lead.