In the paragraph that begins on the bottom of
page 2 and ends on the top of page 3, why does
the author say that brain injuries are "almost
impossible to detect"?

it is because it is the hardest to operate

Explanation:

in night, why are wiesel and his father evacuated from the auschwitz concentration camp? a massive escape makes the nazis question the security of auschwitz. they are assigned to work as laborers in a factory at another camp, buna. hitler has ordered that all remaining jews be relocated within german borders. the german army needs the camp guards to go to the battle front for a last-chance defense.