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Historians Robert Friedel and Paul Israel list inventors of incandescent lamps prior to Joseph Swan and Thomas Edison of General Electric. [4]: 91–93 They conclude that Edison's version was the first practical implementation, able to outstrip the others because of a combination of four factors: an effective incandescent material; a vacuum higher than other implementations which was achieved ...
Pennsylvania. Pennsylvania ( / ˌpɛnsɪlˈveɪniə / ⓘ PEN-sil-VAY-nee-ə, lit. 'Penn's forest country' ), officially the Commonwealth of Pennsylvania[ b] ( Pennsylvania Dutch: Pennsylvanie ), [ 7] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
As you wait for prescription drug costs to come down from the clouds, here's how you can save money on the medications you need. 1. Use a coupon program. If you don't have insurance, a ...
The following lists are lists of countries by military spending as a share of GDP - more specifically, a list of the 15 countries with the highest share in recent years. The first list uses the Stockholm International Peace Research Institute as a source. The second list gets its data from the International Institute for Strategic Studies.
Airbnb slipped nearly 15% after issuing disappointing second-quarter results. Meanwhile, Apple climbed 1.5%.. The benchmark 10-year Treasury yield continued its climb and rose 5 basis points to 3.94%.
Anchorage(Tanaina: Dgheyay Kaq'; Dgheyaytnu), officially the Municipality of Anchorage, is the most populous cityin the U.S. stateof Alaska. With a population of 291,247 at the 2020 census,[5][9]it contains nearly 40 percent of the state's population. The Anchorage metropolitan area, which includes Anchorage and the neighboring Matanuska ...
Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by nuclear fission of uranium and plutonium in nuclear power plants. Nuclear decay processes are used in ...
In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million ( ppm ...