Mary Guedon of the group Raging Grannies holds a sign as she protests in 2010 outside of the Facebook headquarters in California. Privacy advocates say it's too difficult to fully protect your privacy on Facebook.
Justin Sullivan/Getty Images
This light micrograph of a part of a brain affected by Alzheimer's disease shows an accumulation of darkened plaques, which have molecules called amyloid-beta at their core. Once dismissed as all bad, amyloid-beta might actually be a useful part of the immune system, some scientists now suspect — until the brain starts making too much.
Martin M. Rotker/Science Source
Egyptian President Abdel Fattah al-Sisi chairs an Arab foreign ministers meeting during an Arab summit in 2015. Sisi's widely expected victory in the March 26 to 28 polls is seen both as an endorsement by many Egyptians of his hardline security policies and economic aims and the effective crushing by state security institutions of almost all dissent.
Zeb Towne, the elected dogcatcher of Duxbury, Vt. "I'm the only person in the country who gets elected as a dogcatcher. So, I'm awesome, I guess," says Towne.
Amy Kolb Noyes/Vermont Public Radio