When a nail is hammered into an oak tree, it sends a blue vein up the wood. Submitted by Kwiercyski t3_127ss0a on March 31, 2023 at 5:32 PM in mildlyinteresting 7 comments 23
No_Gear1535 t1_jefqkaz wrote on March 31, 2023 at 6:03 PM Iron nails would be hammered into walnut trees to increase the iron content of the nuts Permalink 2
When a nail is hammered into an oak tree, it sends a blue vein up the wood.
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