Our understanding of how the brain works has changed greatly as brain imaging technology has advanced.

FORBES: How You Can Outsmart Your Brain In Work, Love & Life

Pastor LON ROBERTS (President, EscaRosa Coalition on the Homeless): The face of homelessness has changed greatly.

NPR: A Year Later, Hurricane Victims Remain Homeless

The view of food has changed greatly in the past five years but attention has been largely focused on the journey - the air miles - rather than the conditions where the food is sourced.

BBC: The far-away food factories