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These Benjamin Pump guns were manufactured by the Wissler Instrument Co. of St. Louis under a U.S. patent that had been issued to Benjamin. Unlike many air guns of this period, the Benjamin was intended not as a toy, but as a high-power compressed air gun in which pressure was built up by pumping a built-in piston located beneath the barrel.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...
Lavoisier writes the first modern list of chemical elements – containing 33 elements including light and heat but omitting Na, K (he was unsure of whether soda and potash without carbonic acid, i.e. Na 2 O and K 2 O, are simple substances or compounds like NH 3), [91] Sr, Te; some elements were listed in the table as unextracted "radicals ...
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As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium. It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.
The economic history of the Philippines is shaped by its colonial past, evolving governance, and integration into the global economy. Prior to Spanish colonization in the 16th century, the islands had a flourishing economy centered around agriculture, fisheries, and trade with neighboring countries like China, Japan, and Southeast Asia.
Year Date Event Source c.200 AD The Maitum Jars are anthropomorphic jars that were depicting children (head is the lead of the jar with ears and the body was the jar itself with hands and feet as the handle) with perforations in red and black colors, had been used as a secondary burial jars in Ayub Cave, Pinol, Maitum Sarangani province, each of the jars had a "facial expression".
The history of the Philippines dates from the earliest hominin activity in the archipelago at least by 709,000 years ago. [1] Homo luzonensis, a species of archaic humans, was present on the island of Luzon [2] [3] at least by 134,000 years ago. [4] The earliest known anatomically modern human was from Tabon Caves in Palawan dating about 47,000 ...