Hydrogen gas is the least dense substance in the world, at 0.08988g/cc.  Hydrogen solid is the most dense substance in the world, at 70.6g/cc.

Random Facts

• The only capital letter in the Roman alphabet with exactly one end point is P.
  Word and Language Facts
• Bill Gates' first business was Traff-O-Data, a company that created machines which recorded the number of cars passing a given point on a road.
  Science and Technology Facts
• Ninety percent of all species that have become extinct have been birds.
  Animal Facts
• The average person falls asleep in seven minutes.
  Human Facts
• The female lion does ninety percent of the hunting.
  Animal Facts
• It is impossible to sneeze with your eyes open
  Human Facts
• Daylight Saving Time is not observed in most of the state of Arizona and parts of Indiana.
  Misc Facts
• The placement of a donkey’s eyes in its’ heads enables it to see all four feet at all times!
  Animal Facts