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  2. Olmec colossal heads - Wikipedia

    en.wikipedia.org/wiki/Olmec_colossal_heads

    "Olmec-style" face mask in jade. The Olmec civilization developed in the lowlands of southeastern Mexico between 1500 and 400 BC. [3] The Olmec heartland lies on the Gulf Coast of Mexico within the states of Veracruz and Tabasco, an area measuring approximately 275 kilometres (171 mi) east to west and extending about 100 kilometres (62 mi) inland from the coast. [4]

  3. Phases of ice - Wikipedia

    en.wikipedia.org/wiki/Phases_of_ice

    In superionic water, water molecules break apart and the oxygen ions crystallize into an evenly spaced lattice while the hydrogen ions float around freely within the oxygen lattice. [125] The freely mobile hydrogen ions make superionic water almost as conductive as typical metals, making it a superionic conductor. [79] The ice appears black in ...

  4. .17 HMR - Wikipedia

    en.wikipedia.org/wiki/.17_HMR

    .17 Hornady Magnum Rimfire, commonly known as the .17 HMR, is a rimfire rifle cartridge developed by Hornady [3] in 2002. It was developed by necking down a .22 Winchester Magnum Rimfire case to take a .17 caliber (4.5mm) projectile.