Unreferencing should put the object back onto its free list
The upshot: I struggle to imagine a process whereby an obscure English children’s game somehow inspired gestural customs in Georgia, Egypt, Russia, and Iran within less than a century. It seems more reasonable to me that these customs might instead originate in an ancient Mediterranean tradition of apotropaic magic, or charms intended to combat bad luck.
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中國老年人沉迷網絡，究竟到了什麼程度？數據給出了震撼的答案：中國超過60歲的老年人口約3億人，其中老年網民規模已達1.61億，互聯網普及率達52.0%。第三方監測機構「貴士移動」（QuestMobile）的報告顯示，銀髮人群月人均使用時長達129小時，換算下來每天超過4小時，深夜0點仍有超過30%的銀髮用戶活躍在線。
2-phase A* already uses many heuristics which don't always create an optimal route and still 5-10x slower.
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