★ 5.4
★ 7.0
★ 7.4
★ 0.0
★ 7.8
★ 6.7
★ 4.0
★ 8.0
★ 7.5
★ 7.9
★ 6.3
★ 5.0
★ 3.5
What would you take to be the best?
In a hypercompetitive world, drugs like Adderall offer students, athletes, coders and others a way to do more -- faster and better. But at what cost?
