It's easy to get stressed about a malfunctioning Snapchat filter or filled up DVR. But when such inconveniences totally ruin our day, perhaps it's time to remind ourselves what true challenges look like.Such an opportunity exists on Tuesday, May 24 at the Mission Branch Library (3134 Roosevelt Ave.), when Sichan Siv will deliver a program entitled From the Killing Fields to the White House: The American Dream in First Person.…