- What do you think the woman on the left might be thinking?

• The woman on the left might be thinking of guiding the students in this experiment and finding ways of helping them in this experiment. She is also trying to explain the details on this experiment and showing to the students how the experiment of the structure works.

- What might the woman have been doing earlier in the day?

• As the woman on the left is a teacher,she might be teaching other students on this experiment too. The experiment seemed to be difficult for these students to understand,therefore the teachers have to go around explaining to other students in the class to help them understand more about this experiment.

- Why do you think none of the students is smiling?

• One possible reason is that the students are all listening to the teacher carefully and treat the experiment very seriously. As there might be a test coming up,the students have to understand the experiment,so they are trying out the experiment seriously. Another reason that the students are not smiling is that the students are tired and bored of the lesson already. This might be the last lesson of the day and the students might be very tired and are wanting to go back home to have a rest. Furthermore,the students might also hate lessons in school as the lessons are really boring,thus the students are also bored and are not smiling.