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§ 20 § 20 Röntgenverordnung (röv_1987) [§ 20 X-ray Ordinance] (in German) and § Annex+2 Annex 2 (to § 8 para. 1 sentence 1 RöV) (röv_1987) (in German) Depending on the application, nuclear medicine requires even more extensive protective measures, up to and including concrete walls several meters thick.
Search for extraterrestrial intelligence. The search for extraterrestrial intelligence ( SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets.
This is a list of megaprojects, which may be defined as: Projects that cost more than US$1 billion and attract a large amount of public attention because of substantial impacts on communities, the natural and built environment, and budgets. Projects with "initiatives that are physical, very expensive, and public".
The United States five-dollar bill (US$5) is a denomination of United States currency. The current $5 bill features U.S. president Abraham Lincoln and the Great Seal of the United States on the front and the Lincoln Memorial on the back. All $5 bills issued today are Federal Reserve Notes. As of December 2018, the average life of a $5 bill in ...
The Strategic Defense Initiative ( SDI ), derisively nicknamed the Star Wars program, was a proposed missile defense system intended to protect the United States from attack by ballistic nuclear missiles. The concept was announced in 1983, by President Ronald Reagan, [1] a critic of the doctrine of mutual assured destruction (MAD), which he ...
Somerset (/ ˈ s ʌ m ər s ɪ t,-s ɛ t / ⓘ SUM-ər-sit, -set; archaically Somersetshire / ˈ s ʌ m ər s ɪ t. ʃ ɪər,-s ɛ t-,-ʃ ər / SUM-ər-sit-sheer, -set-, -shər) is a ceremonial county in South West England.