A keystone is the wedge at the top of an arch upon which all the other components lean. Keystones are usually masonry in either cut stone, cast stone or brick. The key design feature is the last ...
When Medieval Europeans decided to build massive stone cathedrals, they had to use more complicated designs of arches: one with heavier supports on the sides (called flying buttresses, light blue in ...
Keystone plants and trees like the Coast Live Oak and California lilac are key players in the health of your garden.
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