目前尚不清楚究竟是哪一种风险因素——或更可能在多种因素的共同作用下，推动了青春期年龄的提前，也不清楚为何在不同种族和性别之间存在如此显著的差异。现有国内外研究普遍认为，青春期提前并非单一原因所致，而是多种因素叠加的结果，其中有三类因素被最多提及。
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“My wealth has come from a combination of living in America, some lucky genes, and compound interest,” Buffett wrote in his Giving Pledge letter in 2010. Buffett, along with Bill Gates and Melinda French Gates started the Giving Pledge, encouraging billionaires and other ultra-high-net-worth individuals to give away the vast majority of their wealth during their lifetime or upon their death.，详情可参考谷歌浏览器【最新下载地址】
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