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Natural selection
Natural selection is the phrase Charles Darwin used in 1859 for the process he proposed to explain the origin of species and their apparent adaptation to their environment. Along with the rules of ... > more -
Crane (machine)
A crane is a tower or derrick equipped with cables and pulleys that can be used both to lift and lower materials and to shift them horizontally. Cranes are commonly employed in the construction ... > more -
Albertosaurus
Albertosaurus is a genus of tyrannosaurid theropod dinosaur that lived in western North America during the Late Cretaceous Period, more than 70 million years ... > more -
Trace fossil
Trace fossils are those details preserved in rocks that are indirect evidence of life. While we are most familiar with relatively spectacular fossil hard part remains such as shells and bones, trace ... > more -
Ichthyosaur
Ichthyosaurs were giant marine reptiles that resemble a dolphin with large teeth. They lived during a large part of the Mesozoic era, and appeared about 250 million years ago (Ma), slightly earlier ... > more -
Petroglyph
Petroglyphs are images incised in rock, usually by prehistoric, especially Neolithic, peoples. They were an important form of pre-writing symbols, used in communication from approximately 10,000 ... > more -
Antikythera mechanism
The Antikythera mechanism is an ancient mechanical analog computer (as opposed to digital computer) designed to calculate astronomical positions. It was discovered in the Antikythera wreck off the ... > more -
Excavation
Excavation is the best-known and most commonly used technique within the science of archaeology. Individual excavations are normally referred to simply as "digs" by those who participate, this being ... > more
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