Good internet study tools?

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For bio/physio theories and models that are confusing to visualize I use youtube. I actually use it for tutoring quite a bit too. For instance, there are some good visualizations of the sliding filament theory aswell as transcription and translation.

Youtube is great- actually showed me how to adjust the carborator on my old fishing boat 😀
 
No joke, I did a good 25% of my undergrad studying on wikipedia.
 
There's something wrong with you.
 
Cramster for physics and course heroes.
 
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