These books include videos, which launches via a 4D app. Using simple, engaging text and full-color photos, readers learn about blindness (what blindness is, how it can be caused, and what daily life is like for someone who can't see), deafness (what deafness is, how it can be caused, and what daily life is like for someone who can't hear), wheelchairs (why someone would use a wheelchair and what daily life is like for someone who can't walk), and Leg Braces (how leg braces can help and what daily life is like for someone who wears them). PreK-Grade 3. Paperback.