Moody: peer pressure, puberty, significant changes in certain types and levels of hormones, changes in the structure and function of the brain, access to the internet, current technology. Imagine all these factors combined with their characteristic excitability, moodiness, sexual curiosity, impulsiveness, and the effects of occasional sleep deprivation. Your students will vary greatly in how willing they are to express or mask the influence on their thinking triggered by an incredible array of influences.