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Facts Bifocals were invented in 1784, when Ben Franklin had trouble seeing both close up and far away. Franklin had two pairs of spectacles cut in half and put half of each lens in a single frame.

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Facts Bifocals were invented in 1784, when Ben Franklin had trouble seeing both close up and far away. Franklin had two pairs of spectacles cut in half and put half of each lens in a single frame.

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The invention of bifocals had been reviewed in great detail by Dr. John R. Levene in Chapter 6 of his book .... immigrant to Philadelphia who patented in 1834 a one-piece bifocal which is in fact inverted (upturned).

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The invention of bifocals had been reviewed in great detail by Dr. John R. Levene in Chapter 6 of his book .... immigrant to Philadelphia who patented in 1834 a one-piece bifocal which is in fact inverted (upturned).

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A bifocal lens without a clear dividing line is called a progressive lens. No one can tell you're wearing progressive lenses. The lenses are made so that the transition from near vision to far vision is gradual. One potentially limiting factor in progressives is that more lens space is needed for the transition.

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A bifocal lens without a clear dividing line is called a progressive lens. No one can tell you're wearing progressive lenses. The lenses are made so that the transition from near vision to far vision is gradual. One potentially limiting factor in progressives is that more lens space is needed for the transition.

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Benjamin Franklin was interested in electricity. Being a curious and inventive thinker, Franklin wanted to know more than just the popular tricks. He kept thinking about electricity and came up with a very important idea.

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Benjamin Franklin was interested in electricity. Being a curious and inventive thinker, Franklin wanted to know more than just the popular tricks. He kept thinking about electricity and came up with a very important idea.

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He was one of the fathers of the United States 

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He was one of the fathers of the United States 

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Born: January 17, 1706, Boston, MADied: April 17, 1790, Philadelphia, PA

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Born: January 17, 1706, Boston, MADied: April 17, 1790, Philadelphia, PA

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The movement of rain and ice inside a thundercloud creates an electrical charge, with the negative charge (electrons) forming at the bottom of the cloud and the positive charge (protons) forming at the top.Opposites attract so the negative charge at the bottom of the cloud seeks out a positive charge to connect with.

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The movement of rain and ice inside a thundercloud creates an electrical charge, with the negative charge (electrons) forming at the bottom of the cloud and the positive charge (protons) forming at the top.Opposites attract so the negative charge at the bottom of the cloud seeks out a positive charge to connect with.

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Lightning is a powerful burst of electricity that happens very quickly during a thunderstorm.Lightning is caused by an electrical charge in the atmosphere that is unbalanced.

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Lightning is a powerful burst of electricity that happens very quickly during a thunderstorm.Lightning is caused by an electrical charge in the atmosphere that is unbalanced.

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Bifocals: A bifocal lens is created with two different areas of vision correction, which are divided by a distinct line that sits horizontally across the lens. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision.Apr 24, 2013

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Bifocals: A bifocal lens is created with two different areas of vision correction, which are divided by a distinct line that sits horizontally across the lens. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision.Apr 24, 2013

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Benjamin Franklin invented bifocals in 1784. As announced in a letter to a friend, he called the new invention "double spectacles." The glasses allowed a person to see far or near, depending on what part of the lens they were looking through.

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Benjamin Franklin invented bifocals in 1784. As announced in a letter to a friend, he called the new invention "double spectacles." The glasses allowed a person to see far or near, depending on what part of the lens they were looking through.

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Benjamin Franklin first shocked himself in 1746, while conducting experiments on electricity with found objects from around his house. Six years later and exactly 261 years ago today, the founding father flew a kite attached to a key and a silk ribbon in a thunderstorm and effectively trapped lightning in a jar.Jun 10, 2013

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Benjamin Franklin first shocked himself in 1746, while conducting experiments on electricity with found objects from around his house. Six years later and exactly 261 years ago today, the founding father flew a kite attached to a key and a silk ribbon in a thunderstorm and effectively trapped lightning in a jar.Jun 10, 2013

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Benjamin Franklin invented bifocals or glasses that would allow people to see both near and far. He had two pairs of spectacles cut in half and put half of each lens in a single frame. A reproduction of bifocals designed by Franklin in 1785 above on display at the Freanklin institute science museum in Philadelphia.