The dominant kind of snobbery that exists nowadays is job snobbery. You encounter it within minutes at a party, when you get asked that famous iconic question of the early 21st century, "What do you do?" According to how you answer that question, people are either incredibly delighted to see you, or look at their watch and make their excuses.
衣服和食物不是天上掉下来的,是通过辛勤劳动换来的。
Mental processes evolved to solve practical problems.
The value of a thought is in its consequences for behavior.
The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.