Ultra-pure silver crystal (more than 99.95%); via Wikipedia user Alchemist-hp.
An early version of an interactive visualization of links in Wikipedia.
Bit slip is (sometimes) caused “if a hard drive encounters a long string of 0s, without any 1s (or a string of 1s without 0s), it may lose track of the frame between fields, and suffer bit slip. Thus one prevents long strings without change via such devices as run length limited codes.”
Qibba in Thaghirt Oasis; Béchar, Algeria (photo via Wikipedia user Marina Calvo)
“Crossed” writing, or two pages written on the same side at 90º angles to each other. The above letter is from 1837
Photograph of sesame flatbreads in X’ian, China by Dana Fritz
A selection of Tajik non by Wikipedia user Zlerman
Icelandic laufabraud, with intricate patterns
Via: Wikipedia user Greg L