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2. Go equipment - Wikipedia

   en.wikipedia.org/wiki/Go_equipment

   Commonly used shell and slate Go stone thicknesses are size 32 (8.8 mm) and size 33 (9.2 mm) for most individuals and size 36 (10.1 mm) for professionals. Stones thicker than 10.1 mm are difficult to place on the board, while many Go players prefer stones that are 8.8 and 9.2 mm thick, considering these the optimum thickness for aesthetic and ...

3. Gunpowder - Wikipedia

   en.wikipedia.org/wiki/Gunpowder

   Gunpowder for muzzleloading firearms in granulation size American Civil War re-enactors volley firing with black powder Flash pan starter dispenser. Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive.

4. Supermassive black hole - Wikipedia

   en.wikipedia.org/wiki/Supermassive_black_hole

   These black holes would then have more time than any of the above models to accrete, allowing them sufficient time to reach supermassive sizes. Formation of black holes from the deaths of the first stars has been extensively studied and corroborated by observations. The other models for black hole formation listed above are theoretical.

5. Raven banner - Wikipedia

   en.wikipedia.org/wiki/Raven_banner

   There is no indication that the raven banner was ever carried as a universal flag of Scandinavians. [35] In modern times the Danish Guard Hussar Regiment (est. 1762) seemingly used a raven banner as their coat of arms, perhaps an allusion to the Viking warriors. The raven symbol is still in use by the regiment's 1st Battalion 1st Armoured ...

6. Black Forest - Wikipedia

   en.wikipedia.org/wiki/Black_Forest

   The Black Forest (German: Schwarzwald [ˈʃvaʁt͡svalt] ⓘ) is a large forested mountain range in the state of Baden-Württemberg in southwest Germany, bounded by the Rhine Valley to the west and south and close to the borders with France and Switzerland. [1]

7. List of most massive black holes - Wikipedia

   en.wikipedia.org/wiki/List_of_most_massive_black...

   The supermassive black hole at the core of Messier 87, here shown by an image by the Event Horizon Telescope, is among the black holes in this list.. This is an ordered list of the most massive black holes so far discovered (and probable candidates), measured in units of solar masses (M ☉), approximately 2 × 10 30 kilograms.