Teacher shortages are real, but not for the reason you heard

Timothy Allison, a collaborative special education teacher in Birmingham, Ala., teaches a class at Sun Valley Elementary School on Thursday. The school district is struggling to fill around 50 teaching spots, including 15 in special education, despite $10,000 signing bonuses for special education teachers. (AP Photo/Jay Reeves)

BIRMINGHAM, Ala. — Everywhere, it seems, back-to-school has been shadowed by worries of a teacher shortage.