IS IT POS­SI­BLE FOR YOUR HEAD TO WEIGH TOO MUCH?

BBC Earth (Asia) - - Q&a -

An adult head weighs be­tween 5kg and 6.3kg. Your neck mus­cles could cope with more weight, but an ab­nor­mally large head is usu­ally a sign that some­thing else is wrong. Pro­teus syn­drome, for ex­am­ple, is caused by an ex­tremely rare mu­ta­tion in the AKT1 gene, right at the start of embryonic de­vel­op­ment. This causes ex­ces­sive bone and tis­sue growth, and de­pend­ing where the af­fected cells end up, it can cause a wildly over­sized head. LV

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