How to use discussion...
Frequent small group purposeful talk is essential for students to internalize information. The practice of allowing topic related student discussion after every 10-15 minutes of teacher centered discussion is valuable for deeper understanding of a concept. Short question driven conversations among 3-4 students helps teachers and students to realize any misconceptions that might still be lingering and evaluate the grasp of the new knowledge.
Clue to next station:
A homogeneous mixture of N2 and O2.
"Breathe easy this one isn't too tough"