Design folk wisdom

There's a lot of folk wisdom in interface design. This advice is passed around a lot, but usually has no proof or context to back it up.

1. The aesthetic-usability effect
2. There is an ideal text line length
3. Lots of white space is good
4. Consistency is important
5. Don't use pure black
6. Pure black saves a practical amount of energy
7. What converts well on a landing page
8. Talk to your customers
9. The best interface is no interface

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