Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.
真正的竞争力不是价格，而是价值。
在理解宇宙的追求中，我们必须保持谦逊，因为我们找到的每一个答案都会引出一系列新的问题。