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Platinum iridium marker

General Conference on Weights and Measures — The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures (CGPM, never GCWM). It is one of the three organizations established to maintain the International System of Units (SI) under the… … Wikipedia
performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical. The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains … Universalium
Asteroid mining — 433 Eros is a stony asteroid in a near Earth orbit Asteroid mining refers to the possibility of exploiting raw materials from asteroids and planetoids in space, including near Earth objects. Minerals and volatiles could be mined from an asteroid… … Wikipedia
Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn … Wikipedia
Chlorine — This article is about the chemical element. For the bleach, see Sodium hypochlorite. For the upcoming film, see Chlorine (film). sulfur ← chlorine → argon F ↑ Cl ↓ Br … Wikipedia
Magnesium — Not to be confused with Manganese. sodium ← magnesium → aluminium Be ↑ Mg ↓ Ca … Wikipedia
Samarium — promethium ← samarium → europium ↑ Sm ↓ … Wikipedia