In 1959, about 4.5% of all American men were Freemasons, but in recent years membership has fallen off roughly 75%. Above, the Scottish Rite temple in Washington, D.C. Joe Sohm/Visions of America/Universal Images Group via Getty hide caption
History
Saturday
Irish poet William Butler Yeats circa 1920. Hulton Archive/Getty Images hide caption
Friday
The stage at the U.S. Capitol ahead of President Barack Obama's second inauguration in 2013. John Moore/Getty Images hide caption
Thursday
A Northern Spotted owl sits on a branch. Tom Gallagher/AP hide caption
Tuesday
Included in the missing notebooks is Darwin's famous Tree of Life sketch, according to Cambridge University Library. Cambridge University Library hide caption
Monday
Researchers Hope To Re-Create Historic Scents From History
Friday
The CIA's Secret Quest For Mind Control: Torture, LSD And A 'Poisoner In Chief'
Thursday
Portrait of Dr. Franz Boas. Corbis via Getty Images hide caption
Wednesday
Author Says The Chicago 7 Trial Reflected 'All The Conflicts In America'
Friday
Kotchakorn Voraakhom: How Can We Better Design Cities To Fight Floods?
Rahul Mehrotra: How Can Impermanent Cities Permanently Change Our World?
Marwa Al-Sabouni: How Can The Architecture Of A City Play A Role In War?
Alyssa Loorya: What Can A 300-Year Old Farmhouse Tell Us About Metropolitan New York?
Thursday
The preamble to the US Constitution. Joe Sohm/Visions of America/Universal Images Group via Getty hide caption