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🥱 Why do we yawn, and is it really contagious?

Why do we yawn? Yawning is a universal gesture. Everyone yawns, from babies still in their mother's womb to the elderly.
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'I'm a vet – your dog doesn't just yawn because it's tired or sleepy'

According to veterinarian Andrés Santiago - unlike humans who normally yawn simply because we are tired - there are many reasons why your dog may engage in this activity. Contrary to popular belief, ...