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.
我们开发的每个化学工艺都必须通过三个测试：它安全吗？它可持续吗？它具有可扩展性吗？
"Cinematography is the art of making the invisible visible."
