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Parkour. Parkour (French: [paʁkuʁ]) is an athletic training discipline or sport in which practitioners (called traceurs) attempt to get from one point to another in the fastest and most efficient way possible, without assisting equipment and often while performing feats of acrobatics. [7] With roots in military obstacle course training and ...
Sitting volleyball. Snow volleyball. Water volleyball. Wallyball. A game of squash. Games involving opponents hitting a ball against a wall/walls using a racket, or other piece of equipment, or merely gloved/barehanded: American handball. Australian handball. Basque pelota.
Parkour organizations (3 P) T. Parkour techniques (4 P) Traceurs (1 C, 14 P) Pages in category "Parkour" The following 10 pages are in this category, out of ...
Spiral arms were thought to always trail, meaning that the outermost tip of every spiral arm points away from the direction of the disk's orbital rotation. This is true of the inner spiral arm of NGC 4622 but not of its outer spiral arms. The outer arms of NGC 4622 are instead leading spiral arms, meaning the tips of the spiral arms point ...
Heliospheric current sheet. The heliospheric current sheet, or interplanetary current sheet, is a surface separating regions of the heliosphere where the interplanetary magnetic field points toward and away from the Sun. [1] A small electrical current with a current density of about 10 −10 A /m 2 flows within this surface, forming a current ...
A two-dimensional Poincaré section of the forced Duffing equation. In mathematics, particularly in dynamical systems, a first recurrence map or Poincaré map, named after Henri Poincaré, is the intersection of a periodic orbit in the state space of a continuous dynamical system with a certain lower-dimensional subspace, called the Poincaré section, transversal to the flow of the system.
Messier 106 (also known as NGC 4258) is an intermediate spiral galaxy in the constellation Canes Venatici. It was discovered by Pierre Méchain in 1781. M106 is at a distance of about 22 to 25 million light-years away from Earth. M106 contains an active nucleus classified as a Type 2 Seyfert, and the presence of a central supermassive black ...
NIMT to Wellington. The Raurimu Spiral is a single-track railway spiral, starting with a horseshoe curve, overcoming a 139-metre (456 ft) height difference, in the central North Island of New Zealand, on the North Island Main Trunk railway (NIMT) between Wellington and Auckland. It is a notable feat of civil engineering, having been called an ...