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Polytetrafluoroethylene is a fluorocarbon solid, as it is a high-molecular-weight polymer consisting wholly of carbon and fluorine.PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.
Whale watching off Bar Harbour, Maine. An estimated 13 million people went whale watching globally in 2008, in all oceans except the Arctic. [121] Rules and codes of conduct have been created to minimize harassment of the whales. [122] Iceland, Japan and Norway have both whaling and whale watching industries.
In August 2008, an unmodified F-22 of the 411th FLTS performed the first ever air-to-air refueling of an aircraft using synthetic jet fuel as part of a wider USAF effort to qualify aircraft to use the fuel, a 50/50 mix of JP-8 and a Fischer–Tropsch process-produced, natural gas-based fuel. [201]
The raccoon (/ r ə ˈ k uː n / or US: / r æ ˈ k uː n / ⓘ, Procyon lotor), also spelled racoon [3] and sometimes called the common raccoon or northern raccoon to distinguish it from the other species, is a mammal native to North America.
Mozambique, [d] officially the Republic of Mozambique, [e] is a country located in southeast Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Eswatini and South Africa to the southwest.
Hearing problems are found in 50–90% of children with Down syndrome. [63] This is often the result of otitis media with effusion which occurs in 50–70% [10] and chronic ear infections which occur in 40–60%. [64] Ear infections often begin in the first year of life and are partly due to poor eustachian tube function.