Hard. Some teens had to steer the ships by theirselves. Read "The Witch Of Blackbird Pond" by Elizabeth George speare
they were very strict
Isaac Newton's three laws of motion were published in his work "Philosophiæ Naturalis Principia Mathematica" in 1687.
1687! It is also known as the Principia Mathematica.
4.58e+1687
241 × 7 = 1687
Sir Isaac Newton published his theory of gravitation in 1687 in his famous work "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy).
Philosophiae naturalis principia mathematica is from 1687.
The Connecticut charter was hidden in a hollowed-out tree, known as the Charter Oak, during the late 17th century. When King James II attempted to revoke the charter in 1687, colonial leaders hid it to protect their self-governance. The tree became a symbol of freedom and resistance for the colonists. Eventually, the charter was discovered, but it remained a significant part of Connecticut's history.
185.57 1687 x 0.11 = 185.57
September 19, 1687 fell on a Monday.
his book Mathematical Principles of Natural philosophy was published in 1687
1687 (cubic feet) = 12619.6364 US gallons