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?
By age 3, the child becomes knock-kneed. When the child stands, the knees touch but the ankles are apart. By puberty, the legs straighten out and most children can stand with the knees and ankles touching (without forcing the position). Knock knees can also develop as a result of a medical problem or disease, such as: Injury of the shinbone (only one leg will be knock-kneed)