The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
When withdrawing money from an ATM, the 'whirring' sound before your money pops out is actually a recording. The actual mechanism is so far back that you can't hear it.
282
The streets of Victor, Colorado, once a gold rush town, are paved with low-grade gold.
78
In 1976, an underachieving Princeton junior undergraduate wrote a term paper detailing how to make a nuclear bomb. He got an "A", but never got his paper back because it was seized by the FBI.
16
"Big Ben" in London isn't a tower, the bell inside the tower is called "Big Ben", the tower itself is called "The Elizabeth Tower".
18
A typical lead pencil can draw a line that is 35 miles long.
158