Calculating The Density Of Gold, Licensing Laws And Toxic Algae.

Upon noticing the rising and sinking water level of the public bath he was lounging in one day, the Greek inventor Archimedes realized that water would be useful in helping him calculate the density of gold.

It is illegal to do any form of hair extension in the state of Utah without a cosmetology license, and roughly a third of workers today need a license to do their job.

The toxicity level in blue/green algae is so high that it killed five dogs in the state of Kansas last year.

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