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Semiconductors are in everything from your cell phone to rockets. But what exactly are they, and what makes them so special? Watch and find out from Jamie, a Ph.D. student in Electrical Engineering and Computer Science at MIT.

For years, psychologists have been trying their best to understand the mystery of love and unpack all the complex processes that govern attraction and romantic relationships. And even after decades of countless studies on why we fall in love, fall out of love, stay in relationships, and crave romantic attachments, there’s still a lot left for us to learn, especially when it comes to the earliest stage of love — having a crush. So, here are six Stages of Having a Crush!