Yo Wants to Know: Why Can't I See Color in the Dark? (Unabridged‪)‬

It’s time for bed! As Yo is being tucked in for the night, he notices his toys aren’t the same color in the dark as they are in the daylight. Yo wants to know why his train is no longer red and his ball is no longer green! With his mother’s help, he learns how people’s eyes adjust to seeing in the dark.