Ask HN: How do you validate a business idea? 8 years ago
Actually，the president of YC answered this question in the course of startup schools. I remembered he said several principles or questions, such as "why now?", "why you?",etc.
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Ask HN: A (free) Rails editor for newcomers 8 years ago
VIM Emacs
I recommend tmate.
Web GL Ocean Simulation 13 years ago
which browser can display?
Ask HN: Which javascript charting library to use? 13 years ago
highcharts.com