"This particular issue is very sensitive to customers and we've done some learning, " said Delta spokesman Paul Skrbec.

WSJ: Saving Frequent-Flier Miles From the Ax

It uses machine learning and social media and is very sensitive to privacy concerns often associated with mining data about individuals.

FORBES: You Had Me At 'Shalom'

Researchers at Stanford University and MIT's Picower Institute for Learning and Memory had activated light-sensitive neurons in the brain's hippocampus involved in the memory of fright.

WSJ: Scientists Cast Light Onto Roots of Illness Deep in the Brain