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The telephone is an instrument that converts voice and sound signals into electrical impulses for transmission by wire to a different location, where another telephone receives the electrical impulses and turns them back into recognizable sounds. In 1875, Alexander Graham Bell built the first telephone that transmitted electrically the human voice.

The telephone is an instrument that converts voice and sound signals into electrical impulses for transmission by wire to a different location, where another telephone receives the electrical impulses and turns them back into recognizable sounds. In 1875, Alexander Graham Bell built the first telephone that transmitted electrically the human voice.

Solange Bendavid deported to Sobibor with her mother and younger brother Albert on Mar. 25, 1943.

Solange Bendavid deported to Sobibor with her mother and younger brother Albert on Mar. 25, 1943.

The "hidden mother". In old school pictures, moms would hide from the camera to keep their kids calm and still for pictures. This is really cool and really creepy all at the same time.

The "hidden mother". In old school pictures, moms would hide from the camera to keep their kids calm and still for pictures. This is really cool and really creepy all at the same time.

The first president of the United States, George Washington, is often referred to as the Father of Our Country.

The first president of the United States, George Washington, is often referred to as the Father of Our Country.

Crematorium ovens at Buchenwald.   Photo credit: Florida Center for Instructional Technology

Crematorium ovens at Buchenwald. Photo credit: Florida Center for Instructional Technology

Christiaan Huygens fue un astrónomo, físico y matemático holandés. Nació el 14 de mayo de 1629 en La Haya y murió en el país de nacimiento el día 8 de julio de 1695. En la primera etapa de su vida, Huygens estuvo muy influido por el matemático francés René Descartes durante su etapa en Holanda. Huygens nunca se casó ni tuvo descendencia.

Christiaan Huygens fue un astrónomo, físico y matemático holandés. Nació el 14 de mayo de 1629 en La Haya y murió en el país de nacimiento el día 8 de julio de 1695. En la primera etapa de su vida, Huygens estuvo muy influido por el matemático francés René Descartes durante su etapa en Holanda. Huygens nunca se casó ni tuvo descendencia.

by turns pamphleteer, apprentice, printer, balladeer, inventor, philosopher, politician, soldier, firefighter, ambassador, family man, sage, delegate, signer, shopkeeper, bookseller, cartoonist, grandfather, anti-slavery agitator, Mason, and deist - Benjamin Franklin was all of the above and none of the above

by turns pamphleteer, apprentice, printer, balladeer, inventor, philosopher, politician, soldier, firefighter, ambassador, family man, sage, delegate, signer, shopkeeper, bookseller, cartoonist, grandfather, anti-slavery agitator, Mason, and deist - Benjamin Franklin was all of the above and none of the above

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