Because it could be a dead give away to if someone is in danger around you.
The primary factors for migration among southern African Americans were segregation, an increase in the spread of racist ideology, widespread lynching (nearly 3,500 African Americans were lynched between 1882 and 1968), and lack of social and economic opportunities in the South.
1. Giving some of them trama
2. They give them more support
3. Sometime they come back angry or scared
Radiation its visible light that we see during the day.
