USA - 1956 - A biologist explains how the geographic isolation of caves leads to the evolution of different insect subspecies to live there.
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USA - 1956 - Water is the most common variable that might affect how caves' biology differ from each other.
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USA - 1956 - A biologist uses beetles an example of an insect that has undergone speciation, where subspecies evolve in caves.
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USA - 1956 - A biologist in a cave describes the temperature there and why fungi are the only plant life that can live there.
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USA - 1987 - Biologists study a range of both simple and complex organisms.
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USA - 1987 - A biologist puts probes into a sea slug's brain to study its activity.
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USA - 1987 - An ecologist introduces a cell predator into a culture of paramecium to study how predator and prey coexist.
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USA - 1987 - Equipment is developed for evolutionary biologists to study generations of bacteria in a lab.
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USA - 1987 - Biologists develop genetic engineering.
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USA - 1987 - Scientists link the increase in oxygen in the earth's atmosphere over the centuries to photosynthesis.
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USA - 1987 - Evolutionary biologists study everything from dinosaurs to insect populations.
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USA - 1987 - A montage of different ecosystems across the biosphere.
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USA - 1987 - Molecular biologists study DNA and learn how to alter it in simple organisms.
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USA - 1987 - A montage of biodiversity includes animals and environments.
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1925 - Ships on Donald MacMillan's scientific expedition navigate past ice floes in Greenland, and sailors wave from the crow's nest.
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1925 - Ships on Donald MacMillan's scientific expedition navigate past ice floes in Greenland.
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1925 - Excellent aerial view of ice floes diverging off the coast of Greenland.
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1925 - Inuit families live and travel from Etah, Greenland.
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1925 - Inuit families live in Etah, Greenland.
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1925 - Excellent aerial view of ice floes off the coast of Greenland.
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1925 - A seaplane is carefully navigated into the water off the coast of Greenland.
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1925 - Views from a seaplane flying over the coast of Greenland.
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1925 - Donald MacMillan and his men pose in fur ensembles on the deck of their schooner while on expedition in Greenland.
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1925 - Panoramic views of ice floes off the coast of Greenland.
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1925 - Scientific explorers on a schooner sail past ice floes in Greenland.
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1925 - Scientific explorers pet their guide dogs, and feed a baby bird.
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1920s - Members of the International Grenfall Association show off their residences in Canada.
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1925 - Scientific explorers meet Inuit families in Greenland.
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1925 - Donald MacMillan's schooner, the Bowdoin, navigates ice floes off the coast of Greenland.
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1925 - A seaplane is loaded onto a schooner on a scientific expedition in Greenland.
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1925 - Explorer Donald MacMillan poses with his crew on the deck of his schooner, the Bowdoin, on a scientific expedition in Greenland.
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1925 - Inuit families arrive at the campsite of a scientific expedition in Greenland, and show off their canoe.
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1925 - Donald MacMillan and his hunting party carve up a walrus for its blubber in Greenland.
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1925 - Donald MacMillan prepares to go hunting in Greenland in a canoe.
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1963 - A teenager struggles with building the steering mechanism for his soapbox derby car, and goes to visit his father, a chemistry professor at Howard University, in his lab.
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USA - 1951 - Animation is used to depict the uranium and plutonium developed by atomic scientists.
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USA - 1951 - Animation is used to show how scientists have created new atomic elements such as plutonium.
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USA - 1951 - Hydrogen is found in fuel and water, and was assigned by scientists the atomic number one.
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VIRGINIA - 1950s - A montage of agricultural education classes offered to black and white students at Virginia Polytechnic Institute, also known as Virginia Tech, and other state schools, and montage of jobs they might lead to.
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USA - 1929 - In this silent film, a black janitor is turned white by drinking something a chemist gives him.
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USA - 1929 - In this silent film, a chemist conducts an experiment with flowers.
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USA - 1961 - Lenses are used in binoculars, microscopes and cameras.
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USA - 1980 - Scientists explore the use of photovoltaic cells as a renewable energy source.
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USA - 1939 - While President Wilson's League of Nations fizzles out, the international scientific community unifies the world with myriad inventions and discoveries.
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USA - 1953 - Boys enjoying a summer day playing in the river may one day grow up to be great scientists and industrialists.
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USA - 1953 - Boys who may one day grow up to be great scientists spend their childhood summers playing in a river.
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USA - 1953 - Men and women at a press conference are given jars of a new soil conditioning compound developed by chemists.
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USA - 1953 - Chemists begin their presentation at a press conference about soil rejuvenation.