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Charles Darwin once boldly predicted that buried deep in the earth are transitional fossils of creatures with intermediate features between ancestral animal groups and the modern animal groups. Since Darwin’s time, many transitional fossils have been discovered, and they provide crucial insights into the origin of key structures and the creatures that possess them. And University of Chicago paleontologist and award-winning author Neil Shubin provides a first-hand account of the painstaking search for the transitional fossil of Tiktaalik, a creature with a mix of features common to fish and four-legged animals.
(Source: DCMP)
The discovery of Archaeopteryx in a quarry in Germany in the early 1860s provided the first clue that birds descended from reptiles. In the last 40 years, scientists have identified many shared features between birds and two-legged carnivorous dinosaurs called theropods.
Paleontologists have studied the fossil record of human evolution just like they have done for other major transitions, including the evolution of tetrapods from fish and the evolution of birds from dinosaurs. Sean Carroll and Tim White discuss the most important human fossils and how they illuminate key phases of human evolution, focusing in particular on three traits: larger brains, tool use, and bipedality.
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal.
(Source: Library Lyna)
Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal.
Vanadium is a chemical element with the symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal.
Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, transition metal.
Iron is a chemical element with symbol Fe and atomic number 26. It is a metal that belongs to the first transition series
Zirconium is a chemical element with the symbol Zr and atomic number 40. It is a lustrous, grey-white, strong transition metal
Chromium is a chemical element with the symbol Cr and atomic number 24. It is a steely-grey, lustrous, hard and brittle transition metal.
Nickel is a chemical element with the symbol Ni and atomic number 28. It is a silvery-white lustrous transition metal with a slight golden tinge.
Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.
Thallium is a chemical element with the symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature.
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels.
Niobium, also known as columbium, is a chemical element with the symbol Nb (formerly Cb) and atomic number 41. Niobium is a light grey, crystalline, and ductile transition metal.
Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
Rhodium is a chemical element with the symbol Rh and atomic number 45. It is an ultra-rare, silvery-white, hard, corrosion-resistant, and chemically inert transition metal. It is a noble metal.
Yttrium is a chemical element with the symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare-earth element".
Osmium is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal.
Iridium is a chemical element with the symbol Ir and atomic number 77. It is a very hard, brittle, silvery-white transition metal.
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3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
