Audio Index: 24:31

Topics: Famous Americans: Sacagawea; NASCAR racing; to take its toll (on someone); you are/is; whatever versus whatsoever

Words:

to leave your mark on (something)

expedition

uncharted territory

trapper

to negotiate

racetrack

ratings

to sanction

series

prize money

trophy

collision

to take its toll (on someone)

whatever

whatsoever