In order for NASA to recognize you as an astronaut, you must travel higher than 50 miles from the Earth’s surface.
The eruption of Krakatoa in 1883 was the loudest sound in recorded history, heard 3,000 miles (4800 KM) away.
The world’s largest cave is over 5.5 miles long, has a jungle and river, and could fit a 40-story skyscraper within its walls.
The average pencil holds enough graphite to draw a line about 35 miles (56 KM) long or to write roughly 45,000 words.
If uncoiled, the DNA in all the cells in your body would stretch 10 billion miles, from here to Pluto and back.