Why was it necessary for him to be buried with an erection? I thought you'd never ask! From the Daily Mail:
‘The erect penis evokes Osiris at his most powerfully regenerative moment, and is a feature of 'corn-mummies,' the quintessential symbols of rebirth and resurrection created in honour to Osiris,’ explained Professor Salima Ikran in her scientific paper.
[H/T: Daily Mail]
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