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An unread, unused copy: no writing or highlighting, and no missing or damaged pages. Every book we sell is brand new, including our lowest-priced titles.
Using basic English and standard Latin American Spanish text, this bilingual book teaches kids how sound waves travel and how our ears and our brain collect and interpret those sound waves. Spreads also define hearing impairments, and why loud noises are harmful to the ears, and how to protect the ears from these sounds.