Answer based on context:

Coming off their road win over the Panthers, the Bills went home for a Week 8 duel with the Houston Texans.  In the first quarter, Buffalo struck first as wide receiver Terrell Owens got a 29-yard touchdown run.  The Texans would answer in the second quarter with a 42-yard and a 22-yard field goal from kicker Kris Brown.  The Bills would end the half with kicker Rian Lindell's 21-yard field goal. Houston would creep closer in the third quarter with Brown booting a 26-yard field goal.  In the fourth quarter, the Texans would take the lead and never look back as running back Ryan Moats got three touchdown runs of 11 yards (followed by quarterback Matt Schaub's 2-point conversion pass to wide receiver Andre Johnson), 1 yard, and 3 yards. With the loss, Buffalo went into their bye week at 3-5. Despite the loss, rookie safety Jairus Byrd once again had two interceptions.  He would become the first rookie and only the second player in NFL history to have three-straight multi-interception games.

How many field goals were scored in the first half?
3