Teacher sits with kids using blocks in class, shot on R3D

four people woman 30s adult profession teacher asian ethnicity girl boys pre-teens hispanic ethnicity caucasian kids children multi ethnic group diversity part of person education block play school classroom lesson teaching explaining learning building concentrating looking down busy knowledge discovery students pupils classmates schoolchildren schoolboys schoolgirls school kids childhood elementary school primary school desk sitting counting looking at each other close up waist up usa handheld