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VANDALISM THREAT

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Monopoly

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Picture of the Day

Picture of the day The mangosteen (Garcinia mangostana) is a tropical evergreen tree with edible fruit native to Maritime Southeast Asia, from the Malay Peninsula to Borneo. It is grown mainly in Southeast Asia, southwest India, and other tropical areas such as Colombia, Puerto Rico and Florida, where the tree has been introduced. The fruit is sweet and tangy, juicy, somewhat fibrous, with fluid-filled vesicles (like the flesh of citrus fruits), with an inedible, deep reddish-purple colored rind (exocarp) when ripe. In each fruit, the fragrant edible white flesh that surrounds each seed is the endocarp, the inner layer of the ovary, and is roughly the same shape and size as a tangerine, about 4 to 6 centimetres (1.5 to 2.5 inches) in diameter. This photograph, which was focus-stacked from 22 individual images, shows two mangosteens, one whole, and the other halved to expose the endocarp.Photograph credit: Ivar Leidus

On this Day

December 3 Christiaan Barnard 1283 – During the First Mongol invasion of Burma, the fort at Ngasaunggyan was overrun after a two-month siege. 1927 – Putting Pants on Philip, the first official film featuring the British-American comedy duo Laurel and Hardy, was released. 1967 – Cardiac surgeon Christiaan Barnard (pictured) performed the first successful human heart transplant on Louis Washkansky at Groote Schuur Hospital in Cape Town, South Africa. 1979 – Following the result of a two-day referendum, the current Constitution of Iran was adopted. 1990 – Mary Robinson took office as the first female president of Ireland. Daniel Seghers (b. 1590) Octavia Hill (b. 1838) Mary Bell (b. 1903) Kui Lee (d. 1966) More anniversaries: December 2 December 3 December 4

periodic table

Periodic table Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Hydrogen & alkali metals Alkaline earth metals Triels Tetrels Pnicto­gens Chal­co­gens Halo­gens Noble gases Period 1 Hydro­gen1H​1.0080 He­lium2He​4.0026 2 Lith­ium3Li​6.94 Beryl­lium4Be​9.0122 Boron5B​10.81 Carbon6C​12.011 Nitro­gen7N​14.007 Oxy­gen8O​15.999 Fluor­ine9F​18.998 Neon10Ne​20.180 3 So­dium11Na​22.990 Magne­sium12Mg​24.305 Alumin­ium13Al​26.982 Sili­con14Si​28.085 Phos­phorus15P​30.974 Sulfur16S​32.06 Chlor­ine17Cl​35.45 Argon18Ar​39.95 4 Potas­sium19K​39.098 Cal­cium20Ca​40.078 Scan­dium21Sc​44.956 Tita­nium22Ti​47.867 Vana­dium23V​50.942 Chrom­ium24Cr​51.996 Manga­nese25Mn​54.938 Iron26Fe​55.845 Cobalt27Co​58.933 Nickel28Ni​58.693 Copper29Cu​63.546 Zinc30Zn​65.38 Gallium31Ga​69.723 Germa­nium32Ge​72.630 Arsenic33As​74.922 Sele­nium34Se​78.971 Bromine35Br​79.904 Kryp­ton36Kr​83.798 5 Rubid­ium37Rb​85.468 Stront­ium38Sr​87.62 Yttrium39Y​88.906 Zirco­nium40Zr​91.224 Nio­bium41Nb​92.906 Molyb­denum42Mo​95.95 Tech­netium43Tc​[97] Ruthe­nium44Ru​101.07 Rho­dium45Rh​102.91 Pallad­ium46Pd​106.42 Silver47Ag​107.87 Cad­mium48Cd​112.41 Indium49In​114.82 Tin50Sn​118.71 Anti­mony51Sb​121.76 Tellur­ium52Te​127.60 Iodine53I​126.90 Xenon54Xe​131.29 6 Cae­sium55Cs​132.91 Ba­rium56Ba​137.33 Lute­tium71Lu​174.97 Haf­nium72Hf​178.49 Tanta­lum73Ta​180.95 Tung­sten74W​183.84 Rhe­nium75Re​186.21 Os­mium76Os​190.23 Iridium77Ir​192.22 Plat­inum78Pt​195.08 Gold79Au​196.97 Mer­cury80Hg​200.59 Thallium81Tl​204.38 Lead82Pb​207.2 Bis­muth83Bi​208.98 Polo­nium84Po​[209] Asta­tine85At​[210] Radon86Rn​[222] 7 Fran­cium87Fr​[223] Ra­dium88Ra​[226] Lawren­cium103Lr​[266] Ruther­fordium104Rf​[267] Dub­nium105Db​[268] Sea­borgium106Sg​[269] Bohr­ium107Bh​[270] Has­sium108Hs​[271] Meit­nerium109Mt​[278] Darm­stadtium110Ds​[281] Roent­genium111Rg​[282] Coper­nicium112Cn​[285] Nihon­ium113Nh​[286] Flerov­ium114Fl​[289] Moscov­ium115Mc​[290] Liver­morium116Lv​[293] Tenness­ine117Ts​[294] Oga­nesson118Og​[294] Lan­thanum57La​138.91 Cerium58Ce​140.12 Praseo­dymium59Pr​140.91 Neo­dymium60Nd​144.24 Prome­thium61Pm​[145] Sama­rium62Sm​150.36 Europ­ium63Eu​151.96 Gadolin­ium64Gd​157.25 Ter­bium65Tb​158.93 Dyspro­sium66Dy​162.50 Hol­mium67Ho​164.93 Erbium68Er​167.26 Thulium69Tm​168.93 Ytter­bium70Yb​173.05   Actin­ium89Ac​[227] Thor­ium90Th​232.04 Protac­tinium91Pa​231.04 Ura­nium92U​238.03 Neptu­nium93Np​[237] Pluto­nium94Pu​[244] Ameri­cium95Am​[243] Curium96Cm​[247] Berkel­ium97Bk​[247] Califor­nium98Cf​[251] Einstei­nium99Es​[252] Fer­mium100Fm​[257] Mende­levium101Md​[258] Nobel­ium102No​[259] Primordial  From decay  Synthetic Border shows natural occurrence of the element Standard atomic weight Ar, std(E) Ca: 40.078 — Abridged value (uncertainty omitted here) Po: [209] — mass number of the most stable isotope s-block f-block d-block p-block