Brian Paris, D. It sounds like a pretty extreme condition. And spondylolisthesis can be the source of severe back pain, usually in the lower back. But just like herniated discs , you may have the condition and never know it. Fortunately, there are simple exercises and other actions you can take to prevent progression and get pain relief from spondylolisthesis. In children, most cases of spondylolisthesis are caused by either a birth defect or some type of impact injury, like when playing sports.
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Nuclear weapon designs are physical, chemical, and engineering arrangements that cause the physics package  of a nuclear weapon to detonate. There are three existing basic design types:. A fourth type, pure fusion weapons , is a theoretical possibility. Such weapons would produce far fewer radioactive byproducts than current designs, although they would release huge numbers of neutrons. Pure fission weapons historically have been the first type to be built by new nuclear powers. Large industrial states with well-developed nuclear arsenals have two-stage thermonuclear weapons, which are the most compact, scalable, and cost effective option once the necessary technical base and industrial infrastructure are built. Most known innovations in nuclear weapon design originated in the United States, although some were later developed independently by other states.
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Spondylolisthesis is a medical term that describes an abnormal anatomic alignment between two bones in the spine. This anatomic abnormality has been around since antiquity. It was first described in the modern medical literature by a Belgian obstetrician named Dr.
In , Lockheed Martin NYSE:LMT shocked the world with the announcement that it was building a nuclear fusion reactor and planned to have it online " in as little as ten years. Image source: Commonwealth Fusion Systems. On the opposite side of the country from the fabled Skunk Works, which is working on LockMart's version of the reactor, scientists at the Massachusetts Institute of Technology Plasma Science and Fusion Center are working on a compact fusion reactor of their own, reports The New York Times.