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?
Incisors and Canines. Horses will start to get their permanent incisors when they are about 2-1/2 years old. The middle set of incisors is the first to grow in. The second set of incisors should come in around 3-1/2 years old, and the outside set of incisors should come in around 4-1/2 years old. The adult canine teeth come in between 4-5 years of age. All horses can, but not all horses do have canine teeth. Mares are less likely to have canine teeth, but it is possible.