As thousands across the nation prepare to take to the streets on March 24, 2018, for The March for Our Lives, we're taking a look at some of the root causes, long-lasting effects, and approaches to solving the gun violence epidemic in America. We'll have a new installment every day this week.

In the winter of 2012, an undergraduate student who'd just taken my abnormal psychology course sent me an email.

The note was short, containing a link to an article about Adam Lanza (the Sandy Hook shooter) and two questions: Did mental illness drive him to do what he did? And if so, did that mean that what I'd told her in class, that the mentally ill were no more dangerous than the rest of the population, wasn't true?

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