Plutonium is much rarer in nature than uranium and is more commonly used for bombs rather than as reactor fuel. Like uranium, it comes in various isotope forms, with plutonium 239 the most commonly used. It is mixed with the much more unstable plutonium 240 to generate power.
It's my understanding that a horse's knees close around age 2- 2 1/2. My gelding JUST turned 3. A couple days ago in fact. Will a horse's knees almost certainly be closed by that age?
You get low back pain that radiates into the leg when a disc or bone impinges on a nerve as it exits the spinal cord, most commonly between the 4th and 5th lumbar vertebrae. In people between ages 30 and 60, a ruptured disc is usually responsible; in people over 60, spinal stenosis is more likely to be the cause.