I had an app idea just like ‘Collective’… I have another app idea for studying. You can take pictures or notes of what you’re studying and it’ll automatically cross reference the subject matter and bring up original creators, thinners, inventors, etc. of the topic. You can write notes and it would/could automatically collate your notes. It would send you reminders and connect you to others who are studying the same subject. The whole community would be sort of scholarly and collegiate, like one big library-university. You could put work up, people could openly debate or debunk your ideas/theorems. Everything would be catalogued by subject matter. The newest ideas, formulas would rise to the top and could be presented alongside long standing ideas theorems… but mostly as a study aide.