1.4K views · 15 reactions | In 1938, RCA introduced the poorly-named Indian head test pattern which became universally used to calibrate black and white broadcasts. | Timehop | Facebook

5.7K views · 49 reactions | The most common head shape abnormality in children is positional plagiocephaly, with flattening in the back of the head. Less common is craniosynostosis, in which one or more of the growth plates of the skull fuse prematurely and affect skull and brain growth. Dr. Smyth shares information with parents about various head shape abnormalities and their treatment: | Johns Hopkins All Children's Hospital | Facebook

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