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Espresso. Espresso ( / ɛˈsprɛsoʊ / i, Italian: [eˈsprɛsso]) is one of the most popular coffee -brewing methods, of Italian origin. [1] [2] The French also made a significant contribution to the invention of the first coffee makers, predecessors of today's espresso machines, and generally to the café culture.

The traditional French preparation involves placing a sugar cube on top of a specially designed slotted spoon, and placing the spoon on a glass filled with a measure of absinthe. Iced water is poured or dripped over the sugar cube to mix the water into the absinthe. The final preparation contains 1 part absinthe and 3–5 parts water.

Rectified 9-cubes. In nine-dimensional geometry, a rectified 9-cube is a convex uniform 9-polytope, being a rectification of the regular 9-cube . There are 9 rectifications of the 9-cube. The zeroth is the 9-cube itself, and the 8th is the dual 9-orthoplex. Vertices of the rectified 9-cube are located at the edge-centers of the 9-orthoplex.

9 is the sum of the cubes of the first two non-zero positive integers which makes it the first cube-sum number greater than one. [4] It is also the sum of the first three nonzero factorials and equal to the third exponential factorial, since [5] Non-intersecting chords between four points on a circle.