var facts=new Array()

facts[0]='Water is the most common substance found on earth.'

facts[1]='The only water we will ever have is what we have now.'

facts[2]='Each day the sun evaporates 1,000,000,000,000 (a trillion) tons of water.'

facts[3]='80% of the earth\'s surface is water.'

facts[4]='97% of the earth\'s water is in the oceans and seas.'

facts[5]='66% of your body is water.'

facts[6]='Bones are 25% water.'

facts[7]='Human blood is 83% water.'

facts[8]='A person can survive without food for more than 30 days, but less than a week without water.'

facts[9]='A gallon of water weighs 8.34 pounds.'

facts[10]='The first water pipes made in the U. S. were fire-charred, bored-out logs.'

facts[11]='There are over 59,000 community public water systems in the U. S.'

facts[12]='The average household uses 107,000 gallons of water per year.'

facts[13]='It takes 1,851 gallons of water to refine one barrel of crude oil.'

facts[14]='It takes 120 gallons of water to produce one egg.'

facts[15]='A single birch tree will give off 70 gallons of water per day in evaporation.'

facts[16]='An acre of corn will give off 4,000 gallons of water per day in evaporation.'

var whichfact=Math.floor(Math.random()*(facts.length))
document.write(facts[whichfact])