Editor's Selections: The Smell of Fear, Placebo genes, Race and penis size and Mapping the Brain

Here are my medicine, neuroscience and psychology ScienceSeeker Editor's Selections for the week:

• The Scorpion and the Frog's Miss Behavior sniffs out a study on the 'Smell of Fear'.
• Steven Novella discusses recent reports of the 'placebo gene' at Science-Based Medicine. 
• Scott McGreal from Eye on Psych unravels a new study looking at racial background and penis size.
• And Ferris Jabr discusses how DNA barcoding may help scientists map the brain.

This post was written by Andrew Watt for A Hippo on Campus.