== Description == In knot theory, the 63 knot is one of three prime knots with crossing number six, the others being the stevedore knot and the 62 knot. It is alternating, hyperbolic, and fully amphichiral. It can be form the braid word == Symmetry == Like the figure-eight knot, the 63 knot is fully amphichiral. This means that the 63 knot is amphichiral, meaning that it is indistinguishable from its own mirror image. In addition, it is also invertible, meaning that orienting the curve in either direction yields the same oriented knot. == Invariants == The Alexander polynomial of the 63 knot is...

Ultimate is a limited-contact team field sport played with a disc (frisbee). Points are scored by passing the disc to a teammate in the opposing end zone. Other basic rules are that players must not take steps while holding the disc (maintain a pivot), and interceptions and incomplete passes are turnovers. At peak play there is a higher cooperation within the striving competition. Rain, wind, or occasionally other adversities can make for a testing match, with rapid turnovers, heightening the pressure of play. A prominent feature of the modern game is the "lay out," a horizontal dive to catch or...

Buck Danny is a Franco-Belgian comics series about a military flying ace and his two sidekicks serving (depending on the plots) in the United States Navy or the United States Air Force. The series is noted for its realism both in the drawings and the descriptions of air force procedures as part of the storyline. In particular the aircraft depicted are extremely accurate. Mixing historical references with fiction, Buck Danny is one of the most important 'classic' Franco-Belgian comic strips. Starting in 1947, the first albums were set against the backdrop of World War II, but from 1954 onwards,...