Amyotrophic lateral sclerosis (ALS), sometimes called Lou Gehrig's disease, is a rapidly progressive, invariably fatal neurological disease that attacks the nerve cells (neurons) responsible for controlling voluntary muscles.
The Alpine Scheitholt furnishes an example of this older type of European zither. By the late 18th century, two principal varieties of European concert zither had developed, known as the Salzburg zither (with a rounded side away from the player), and the Mittenwald zither (with both sides rounded).
Leaf Blower Types. Handheld: Handheld leaf blowers are the most common type for people interested in cleaning up leaves around a home. Backpack: Backpack leaf blowers are ideal for commercial or heavy-duty uses. Blowers with leaf vacuums: Some types of leaf blowers can convert into vacuums. This gives people the option to pick up and mulch light debris. Walk-behind blowers: Walk-behind blowers are ideal for heavy-duty cleanup jobs.