In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid is in a turbulent flow regime. The moving fluid creates a space devoid of downstream-flowing fluid on the downstream side of the object. Fluid behind the obstacle flows into the void creating a swirl of fluid on each edge of the obstacle, followed by a short reverse flow of fluid behind the obstacle flowing upstream, toward the back of the obstacle. This phenomenon is naturally observed behind la
Opened on January 15, 1975, Space Mountain is the oldest operating roller coaster in the state of Florida, and is the original version of the iconic attraction that has since been replicated at all of The Walt Disney Company's Magic Kingdom-style theme parks worldwide, except for the Shanghai Disneyland Resort.
The first woman in space: Valentina Tereshkova flew in space aboard the Vostok 6 on June 16, 1963. The first American woman in space: On June 18, 1983, the space shuttle Challenger lifted off with Sally Ride aboard. She was the first American woman in space. The youngest American in space: Besides being the first American woman in space, Sally Ride was also the youngest American when she rode the Challenger in 1983.