What is a migraine with aura, and what causes it? Scientists arenât sure what causes migraines with aura. Itâs thought that at least two brain chemicals called serotonin and dopamine play a role. According to the theory, something goes awry in the way these chemicals regulate brain function. This may cause the brain and the bodyâs immune system to overreact.
The 1899 Spiders set the major league record for most consecutive losses in a season (24, from July 26 to September 16), and had six losing streaks of 10 games or more.
List of worst Major League Baseball season records. Listed below are the Major League Baseball teams with the worst season won-lost records, as determined by winning percentage (.300 or less), minimum 120 games played.