Slate slide show on head scarves and turbans, marking the 39th anniversary of Sikh businessmen winning the right to wear turbans in the workplace.

Quoted: This week in 1969, Sikh busmen in Wolverhampton, United Kingdom, won the right to wear turbans on duty after a long-running campaign. Abbas and other Magnum photographers illustrate the rise in head-scarf wearing and the debate surrounding the right to wear a symbolic religious article of clothing.

There's a lot of great news analysis today assessing how far we've really come since MLK's assassination 40 years ago.

Quoted: Today marks 40 years since the assassination of Martin Luther King Jr. During his last speech, given the night before his death, he said what would turn out to be prophetic words: “I’ve been to the mountaintop. … I’ve seen the promised land.”

Wow, this week marks the 49th anniversary of the Dalai Lama's exile from Tibet. Some great pictures in this slide show...

Quoted: This week in 1959, the 14th Dalai Lama, Tenzin Gyatso, fleeing the Chinese suppression of a national uprising in Tibet, crossed the border into India, where he was granted political asylum.

Grim scenes on a grim anniversary.

Quoted: Today marks five years since the United States invaded Iraq in March 2003. Magnum presents some scenes of events leading up to, during, and after the war “ended.”

A Slate/Magnum slide show commemorating Martin Luther King Day (personally, I think I should be off from work).

Quoted: The crowd during the call to the Prayer Pilgrimage for Freedom, led by Martin Luther King Jr., 1957.

Amazing slide show of the events that unfolded in Iran in the late 1970s into the 80s.

Quoted: In 1979, the shah fled the country after months of violence and pro-Khomeini demonstrations. Days later, Ayatollah Khomeini returned after several years in exile. And in 1981, Tehran freed 52 American hostages who had been held in the embassy for 444 days. Magnum presents images surrounding these critical events in history.

An important Slate article examining why using unspecific stock photography to generally illustrate jourmalistic stories can be extremely misleading.

Quoted: Nature Medicine's goof—or one like it—can happen at any publication that uses stock images to illustrate, not necessarily document, articles.

A Slate/Magnum slide show celelbrating the anniversary of the day Rosa Parks refused to give up her seat.

Quoted: This weekend marks the anniversary of the day that Rosa Parks, a black seamstress, defied the law by refusing to give up her seat to a white man aboard a Montgomery, Ala., city bus in 1955.