How did beethoven learn to play piano when he was deaf?

What does the phrase chamber stand for?

Bile juices in the breakdown of fats. an injury to the (liver, mouth, or salivary glands) may cause a decrease in the production of bile juices. this decrease in bile juices may lead to decreased production of (amino acids, carbohydrates, or fatty acids)

What does it mean to have a bias (for example your bias of bts)?