- Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer can be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin folium, meaning “leaf”, and refers to the sheet-like planar structure. It is caused by shearing forces (pressures pushing different sections of the rock in different directions), or differential pressure (higher pressure from one direction than in others). The layers form parallel to the direction of the shear, or perpendicular to the direction of higher pressure. Nonfoliated metamorphic rocks are typically formed in the absence of significant differential pressure or shear. Foliation is common in rocks affected by the regional metamorphic compression typical of areas of mountain belt formation (orogenic belts).
- Cornbread (graffiti artist) (Wikipedia)
Darryl McCray (born 1953), better known by his tagging name Cornbread, is an American graffiti writer from Philadelphia. He is widely considered the world’s first modern graffiti artist. McCray was raised in Brewerytown, a neighborhood of North Philadelphia. During the late 1960s, he and a group of friends started doing graffiti in Philadelphia, by writing their monikers on walls across the city. Independently to Philadelphia, the graffiti movement was evolving in New York City and blossomed into the modern graffiti movement, which reached its peak in the U.S. in the late 1970s and early 1980s, and then spread to Europe. McCray later worked with the Philadelphia’s Anti-Graffiti Network and Mural Arts Program to help combat the spread of graffiti in the city. He is currently a public speaker and a youth advocate.