The Soviet Union duplicated its dual-launch feat with Vostok 5 and Vostok 6 (June 16, 1963). This time they launched the first woman (also the first civilian), Valentina Tereshkova, into space on Vostok 6. Launching a woman was reportedly Korolev's idea, and it was accomplished purely for propaganda value.
Lumen: A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it is Latin for light, including the light that comes through a window. When a hollow organ is cut across, you can see light through the space that has been opened. So the word lumen came to mean this space.
While the liver is the largest internal organ, the skin is considered the largest organ, in general. However, it has been contended that the skin is not an organ. The Skin is an Organ. An organ is defined as a part of the body that performs one or more specific functions.he largest organ in the body is the skin, which covers a surface area of around two square meters, and performs some vital bodily functions.