Lived from 1254-1324 Some years before St. Louis led his last Crusade there was born in Venice a boy named Marco Polo. His father was a wealthy merchant who often went on trading journeys to distant lands. In 1271, when Marco was... Read more of Marco Polo at Biographical.caInformational Site Network Informational
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Feathers Heavier Than Lead








At one end of a fine balance, hang a piece of lead, and at the other
as many feathers as will poise it; then place the balance in the
receiver. As the air is exhausted, the feathers will appear to
overweigh the lead, and when all the air is drawn off, the feathers
will preponderate, and the lead ascend.





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