In this video from NOVA scienceNOW, learn about a computer program that uses MRI brain scans to decipher what a person was thinking. Correspondent David Pogue, New York Times technology columnist, visits Carnegie Mellon University to find out about a mind-reading computer experiment conducted by psychologists and computer scientists. Particular areas of the brain are associated with thinking about certain words. The computer analysis identifies what object a person was thinking about based on brain scans that show the areas that were activated.

From the tsunami in the Philippines to Edward Snowden's revelations about the NSA, Malala Yousafzai's speech to the U.N. to the death of Nelson Mandela, the events of 2013 have made an indelible mark on the world and every person who lives in it. To look back at every triumph, tragedy and trend, Google creates an annual Zeitgeist, a summary of the biggest events of the year as seen through the eyes of the search engine. This year, NewsHour Extra partnered with Google to offer you, the student, the opportunity to create your own Zeitgeist by compiling the events that have made the biggest impact on your own life using the storytelling tool Meograph.