A man uses a smartphone in New York City, in this picture taken November 6, 2013.
The Pfizer logo is seen at their world headquarters in New York April 28, 2014.
Gale Crater on the planet Mars, is shown in this artist's depiction provided by NASA December 8, 2014.
An unmanned Antares rocket is seen exploding seconds after lift off from a commercial launch pad in this still image from video shot by Matthew Travis of Zero-G News from the press area at Wallops Island, Virginia October 28, 2014.
Visitors look at tablets at the Intel booth during the 2014 Computex exhibition at the TWTC Nangang exhibition hall in Taipei June 3, 2014. Computex, the world's second largest computer show, runs from June 3 to 7.
Dr. Phil McGraw, television personality and psychologist, talks about cyber-bullying during a hearing of the Healthy Families and Communities Subcommittee of the U.S. House Committee on Education and Labor, on Capitol Hill in Washington, June 24, 2010.
Members of Sierra Leone's Junior Doctors Association, which forms the bulk of the local doctors fighting Ebola in the country, have gone on a partial strike over the lack of care for local medics who are infected while working.
Scientists at the National Microbiology Lab in Winnipeg, Manitoba, prepare an experimental Ebola vaccine for shipment to the World Health Organization (WHO) in Geneva in this undated handout picture released October 18, 2014.
