In purely economic terms, methane leaks from well-heads and pipelines cost the oil and gas industry between $6bn and $30bn a year. In the US, methane leaks from the natural gas and petroleum industry are now the number one source of methane emissions, surpassing livestock digestion and landfill. Although it …

Combat aircraft have continued to evolve since the introduction of the jet engine during World War II, exemplified by the F-16, first flown in 1974, the F-22 (1990), and the F-35 (2001). These aircraft are characterized by a traditional wing/body/tail arrangement, are all commanded by an on-board pilot, and are …