Weekly Link Dump for 2010-06-11

• American Death Triangle
  Also known as the “American Triangle”, “Death Triangle” or “Triangle Anchor”, it is a type of rock climbing anchor infamous for being a poor anchoring technique due to both the way the forces of the load are magnified on the fixed anchors and the lack of redundancy in the cord.
• Pogo oscillation
  A potentially dangerous type of self-excited oscillation  caused by combustion instability in liquid fuel rocket engines.  This oscillation results in variations of thrust from the engines, generally caused by variations in fuel flow rate, and placing stress on the frame of the vehicle.
• Hyperboloid structures
  These are architectural structures designed with hyperboloid geometry. Often these are tall structures such as towers where the hyperboloid geometry’s structural strength is used to support an object high off the ground, but hyperboloid geometry is also often used for decorative effect as well as structural economy. The first hyperboloid structures were built by Russian engineer Vladimir Shukhov (1853–1939).  The world’s first hyperboloid tower is located in Polibino, Lipetsk Oblast, Russia. The shapes are doubly ruled surfaces (hence can be built with a lattice of straight beams).
• The Mother of All Demos
  A name given retrospectively to Douglas Engelbart’s December 9, 1968 demonstration at the Fall Joint Computer Conference (FJCC) at the Convention Center in San Francisco, in which a number of experimental technologies that have since become commonplace were presented. The demo featured the first computer mouse the public had ever seen, as well as introducing interactive text, video conferencing, teleconferencing, email, hypertext and a collaborative real-time editor.
• Paella
  Aa Valencian rice dish that originated in its modern form in the mid-19th century near lake Albufera, a lagoon in Valencia, on the east coast of Spain. It consists of white rice, green vegetables, meat (rabbit, chicken, duck), snails, beans and seasoning, although sometimes seafood replaces the meat.

Images:
American Death Triangle, from Wikipedia
Adziogol hyperboloid Lighthouse by Vladimir Shukhov 1911, from Wikipedia
Paella de marisco 01, from Wikipedia