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Naturally occurring zinc ( 30 Zn) is composed of the 5 stable isotopes 64 Zn, 66 Zn, 67 Zn, 68 Zn, and 70 Zn with 64 Zn being the most abundant (48.6% natural abundance ). Twenty-eight radioisotopes have been characterised with the most stable being 65 Zn with a half-life of 244.26 days, and then 72 Zn with a half-life of 46.5 hours.
Wikipedia [c] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki.
During her time as San Francisco District Attorney, Harris created the Environmental Justice Unit in the San Francisco District Attorney's Office [231] and prosecuted several industries and individuals for pollution, most notably U-Haul, Alameda Publishing Corporation, and the Cosco Busan oil spill. She also advocated for strong enforcement of ...
The Boeing 747 is a long-range wide-body airliner designed and manufactured by Boeing Commercial Airplanes in the United States between 1968 and 2023. After the introduction of the 707 in October 1958, Pan Am wanted a jet 2 + 1 ⁄ 2 times its size, to reduce its seat cost by 30%.
In the late 1980s, a military dictatorship was established in Myanmar. Naturally, the military government didn't encourage the celebration of Aung San's birthday and, by extension, Children's Day. The situation began to change after the 2011–2012 democratic reforms. Today, Children's Day is officially celebrated in schools across Myanmar.
Environmental impact assessment ( EIA) is the assessment of the environmental consequences of a plan, policy, program, or actual projects prior to the decision to move forward with the proposed action. In this context, the term "environmental impact assessment" is usually used when applied to actual projects by individuals or companies and the ...
Muhammad Ali Jinnah's first speech to the Constituent Assembly of Pakistan. Maulana Shabbir Ahmad Usmani, a respected Deobandi alim (scholar) who held the position of Shaykh al-Islam in Pakistan in 1949, and Maulana Mawdudi of Jamaat-i-Islami played key roles in advocating for an Islamic constitution. Mawdudi insisted that the Constituent Assembly declare the "supreme sovereignty of God" and ...
Legend has it that, while signing the Civil Rights Act of 1964, Johnson told an aide, "We have lost the South for a generation," as he anticipated coming backlash from Southern whites against the Democratic Party. [72] The Civil Rights Act was later upheld by the Supreme Court in cases such as Heart of Atlanta Motel, Inc. v. United States. [43]