Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
The modern standard piano has 88 keys. Different from your average piano... There is also type of piano called a Cottage piano which is missing the top and bottom octave of a normal sized 88 key keyboard and hence has 64 keys. There are many other styles of piano with varying numbers of keys. There are two BÃ¶sendorfer pianos that have more than 88 keys: the 7'4 BÃ¶sendorfer 225 has 92 keys, and the 9'6 BÃ¶sendorfer 290 has 97 keys.