If people brushed their teeth as often as they claimed, and used the amount of toothpaste they indicated, three times as much toothpaste would be sold in the United States than is actually sold (Barringer, 1993).
lunes, 30 de noviembre de 2009
Gun powder
Did you KNOW
that gun powder was discovered in the 9th century by Chinese alchemists who were searching for an elixir of immortality?
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