American Football Player Leaves NFL to Study Math

rush – n. a strong feeling or emotion caused by a drug or by something exciting

dominate – v. to have control of or power over (someone or something)

tackle – v. to forcefully seize (someone) and cause that person to fall to the ground

chronic traumatic encephalopathy – n. a brain disease caused by regular impacts to the head

practice – n. the activity of doing something again and again in order to become better at it

endeavor – n. a serious effort or attempt

genius – n. a very smart or talented person : a person who has a level of talent or intelligence that is very rare or remarkable