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Well for me, even if wikipedia may not be accurate, lack accountability or have all the bells and whistles of a commercial reference work, its like a collective memory of humanity. It may not be always accurate, because over time generations forget or deform facts (sometimes deliberately) , but its better than nothing.
The acorn is the nut of the oak tree and its close relatives, in the family Fagaceae. Acorns usually contain a seedling surrounded by two cotyledons (seedling leaves), enclosed in a tough shell known as the pericarp, and borne in a cup-shaped cupule. This acorn of the species Quercus robur (the pedunculate oak), with a length of 25 millimetres (1 inch), was photographed in Keila, Estonia.Photograph credit: Ivar Leidus