PK-2 ┊ 283 words ┊ ◄))
PK-2, 283 words, 3 minutes audio time.
Everyone yawns, including tiny babies and furry animals. But what makes us yawn? Are we tired, bored, or just copying someone else? Using simple, informative text and colorful photos, young readers find out all the theories scientists have about why we yawn.
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