Marie Curie's whole life is an argument against fear. She came from nothing, studied in secret when women weren't allowed, moved to Paris broke, and out-worked everyone around her.
She discovered new elements and named the thing she was studying: radioactivity. Two Nobel Prizes, in two different sciences — still the only person to ever do that.
And she did it in a cold shed, dismissed by half the establishment for being a woman, never chasing money or fame. The work was the point.
Her most famous line is the one to hold when you feel lost: 'Nothing in life is to be feared, it is only to be understood.' The unknown feels like a threat until you turn toward it and start to understand it. Then it's just the next thing to learn.