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.
A lymph node is a small organ in the lymph or lymphatic system, an interconnected system of organs, vessels, ducts and nodes that allows the lymph to circulate all over the body. lymph node is a small organ in the lymph or lymphatic system, an interconnected system of organs, vessels, ducts and nodes that allows the lymph to circulate all over the body.