Rule of 7 in research. You can find out anything if you are willing to go seven levels. If the first source you ask doesn’t know， ask them who you should ask next， and so on down the line. If you are willing to go to the 7th source， you’ll almost always get your answer.

Innovation in mining technology is what will keep the industry alive in the next century.

认为世界上只有一种真理，而自己正掌握着它，在我看来这是世界上所有邪恶最深的根源。

煤炭的未来取决于我们能否使其更清洁、更高效。

"One must be an inventor to read well. There is then creative reading as well as creative writing."