Her older brother, Carlos, who was in his second year of Engineering, noticed her frustration.

One Thursday evening, she faced Problem 27: "Un protón entra perpendicularmente en un campo magnético uniforme de 0.2 T..." She knew the formulas: ( F = qvB ) and ( F = m a_n ). But when she tried to equate them to find the radius, she kept getting ( 10^{-5} ) meters instead of the expected ( 10^{-2} ). After an hour, she was on the verge of tears.

He pulled up a PDF on his tablet. It was the .