USB means you can plug it straight into your computer. If you have up to $50-$100 dollars to spend and want to buy a dedicated microphone (which would be the recommended way of doing things for the best quality), start looking for a “ USB cardioid dynamic microphone”.
What makes Sal Khan’s videos so special, though (other than his vast knowledge and his knack for breaking complicated subjects down into easily understandable chunks) is the way he uses the medium to deliver information.
What started as one man making videos to tutor his younger cousins and extended family over the internet quickly became one of the biggest and most comprehensive online educational resources, with courses on topics that range from math to programming, finance and history. If you ever tried to learn anything math or physics related over the internet, you’ve undoubtedly stumbled upon Khan Academy.
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