Downtown Cairo is plastered with huge posters of Gen. Abdel-Fattah el-Sissi, the U.S.-trained Egyptian army chief who helped overthrow President Mohammed Morsi. Amr Abdallah Dalsh/Reuters/Landov hide caption

In lieu of names, this headstone was engraved with a quote: "We grow afraid of what we might forget. We will find peace and value through community in knowing that we belong to each other. Dedicated to the Citizens of Bernalillo County." Carrie Jung/KUNM hide caption

Democracy demonstrators wave the Burmese flag in August 1988, when millions of Burmese took to the streets. Students led the protests, but were soon joined by civil servants, police, soldiers and ordinary citizens. Courtesy of Gaye Paterson hide caption

Julia della Croce says pistachio pesto is an economical — and delicious — alternative when Italian pine nuts can cost up to $120 per pound. Nathan Hoyt/Courtesy of Julia della Croce hide caption

U.S. Postal Service letter carrier Jamesa Euler delivers mail in the rain in Atlanta in February. David Goldman/AP hide caption

Plants accumulate carbon in the spring and summer, and they release it back into the atmosphere in the fall in winter. And a change in the landscape of the Arctic tundra, seen here, means that shrubs hold onto snow better, which keeps the organic-rich soils warmer and more likely to release carbon dioxide that's stored there. Jean-Erick Pasquier/Gamma-Rapho via Getty Images hide caption

A red blood cell infected with malaria parasites (blue) sits next to normal cells (red). NIAID/Flickr.com hide caption