In which order do these main ideas appear in the text?
1 Crowds are attractive to many people.
3 Crowds are inherently dangerous.
5 Crowds are useful economic tools.
7 Crowds are useful instruments in creating beauty.
6 Crowds are useful to increase your knowledge.
4 Crowds can achieve great things.
2 Crowds can turn into a force for evil.
8 Crowds have formed more easily in recent decades.