Student homelessness in the US is a tricky thing to quantify. HUD -- the federal government's Department of Housing and Urban Development -- controls most of the money used to help the homeless. But, that agency misses about 4 in 5 homeless students. Why? It’s all about how you define the term “homeless”. According to HUD, you’re only considered homeless if you’re living in a shelter or living on the streets. But according to the Department of Education, about 80% of the 1.3 million homeless students living in the US are couch surfing, living in motels, or doubling up with family or friends. These students aren’t eligible for HUD money, so increasingly, it’s up to schools to provide help. Host Myles Bess explores how homeless students get the help they need when different federal agencies use competing definitions to define who’s homeless.