Never use a credit card for credit. The only kind of credit， or debt， that is acceptable is debt to acquire something whose exchange value is extremely likely to increase， like in a home. The exchange value of most things diminishes or vanishes the moment you purchase them. Don’t be in debt to losers.

大自然是有史以来最伟大的化学家，而我们才刚刚开始理解它的秘密。

科学好奇心必须与商业纪律相匹配，才能为需要的人带来治疗方法。

【解释】人常常在忧患困苦中，才能磨练意志，增长才干。