TylerRayne:
Eli Whitney's cotton gin.
TylerRayne:
Telephone in use by a woman in 1912.
TylerRayne:
Printing press like Franklin used in Philadelphia.
TylerRayne:
Replica of Morse's first telegraph instrument.
TylerRayne:
Sir William Herschel's reflecting telescope.
TylerRayne:
Light bulb, illuminated.
TylerRayne:
Magnetic field, earth surrounded by.
TylerRayne:
Magnetic field shown by iron filings around bar magnet.
TylerRayne:
Circuits, parallel and series; each missing a bulb.
TylerRayne:
Cell, animal.
TylerRayne:
Cellular structures, cytoplasm, membrane, nucleus, and chromosomes.
TylerRayne:
Cell, plant.
TylerRayne:
Planet Earth
TylerRayne:
Windmills in Kinderdijk, in the Netherlands.
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Venice, Italy.
TylerRayne:
Polar Bear on ice.
TylerRayne:
Ozone pollution, leaf damaged by (2).
TylerRayne:
Ozone pollution, leaf damaged by (4).
TylerRayne:
Ozone pollution, leaf damaged by (3).
TylerRayne:
Ozone layer blocks ultraviolet rays.
TylerRayne:
Ozone molecule being split apart by free chlorine atom from CFC molecule.
TylerRayne:
Ozone layer, CFCs rising.
TylerRayne:
Ozone pollution, newspaper headlines about.
TylerRayne:
Ozone layer, location in atmosphere of.
TylerRayne:
Ozone pollution, leaf damaged by (1).
TylerRayne:
Mud patterns
TylerRayne:
Map of Underground Railroad
TylerRayne:
The Pony Express
TylerRayne:
The Donner Party in the Sierra Nevada snow
TylerRayne:
Recreation, Kansas village on the Oregon Trail
