It's a system a letters that can be understood using touch. It is made for those with weak vision. This system can help blind people with understanding things from an elevator floor to a story book!
Answer:
Sometimes they can be rivals, or can also mean that they are slave, but it can also be because of racism.
Answer:
Depends on how much you want to learn really, schools usually just make you learn all sorts of parts of the subject. Some that could be necessities and some that you would rarely use.
Explanation:
Baking soda is a fine powder.
