• monoamine oxidase - involved in removing the neurotransmitters norepinephrine, serotonin and dopamine from the brain
• peptide phenylethylamine - an opioid peptide that stokes production of dopamine and norepinephrine; also present in chocolates

geography -

• ten things to consider when making a map
• cartographic anomalies: how map projections have shaped our perceptions of the world
• map projections
• world city populations