Hoping to snap a five-game losing streak, the Titans stayed at home for a Week 14 AFC South duel with the Indianapolis Colts on Thursday night.  Tennessee trailed in the first quarter as Colts running back Javarris James got a 1-yard touchdown run.  Indianapolis added onto their lead in the second quarter with quarterback Peyton Manning completing a 1-yard and a 19-yard touchdown pass to wide receiver Pierre Gar&#231;on.  The Titans answered with a 1-yard touchdown run from running back Chris Johnson. Tennessee slowly crept back into the game in the third quarter as quarterback Kerry Collins found tight end Craig Stevens on a 7-yard touchdown pass, yet the Colts responded with kicker Adam Vinatieri making a 21-yard field goal.  Indianapolis added onto their lead in the fourth quarter with Vinatieri booting a 28-yard field goal.  The Titans tried to rally as Collins connected with tight end Bo Scaife on a 4-yard touchdown pass, but the Colts came right back with Vinatieri's 47-yard field goal.  Tennessee closed out the game with Collins finding Scaife on a 2-yard touchdown pass.
Question: How many more touchdowns were scored in the first half than in the second?
Answer: 2