Scientists who checked the health of endangered black rhinos suspended upside-down have been awarded this year’s Ig Nobel prize for work that “makes you laugh, then makes you think.” CBS News’ Debora Patta has the story from Johannesburg. Source

Feltman’s hot dogs were the first and original hot dogs before Nathan’s. Feltman’s story is not well known around most of the country, but it’s legendary in Coney Island. A trio of brothers grew up hearing stories of the old Feltman’s restaurant and now, two of those brothers have brought Feltman’s back, carried by the memory of the one they lost on 9/11. Jeff Glor has the story. Source

Tunnel to Towers began with one runner, Stephen Siller, a valiant firefighter trying to get to the Twin Towers on 9/11 any way he could. Now, tens of thousands travel that same route every year, while others are walking an even greater distance to honor his heroic sacrifice and that of his colleagues. Dana Jacobson has their story. Source

The events of September 11, 2001 led to the U.S. war in Afghanistan, which came to an end last month. The campaign was part of the “War on Terror.” One decorated commander, a former head of special operations, was involved in key developments along the way. Catherine Herridge has his story. Source

Elvis Perkins joins this week’s Saturday Sessions. Alongside bandmates that include his mother’s godson and a longtime family friend, Elvis Perkins performs “Emile’s Vietnam in The Sky” — a song that from his 2007 debut record “Ash Wednesday.” Source

Elvis Perkins joins this week’s Saturday Sessions. Alongside bandmates that include his mother’s godson and a longtime family friend, Elvis Perkins performs “Good Friday” — a song that from his 2007 debut record “Ash Wednesday.” Source

Elvis Perkins joins this week’s Saturday Sessions. Alongside bandmates that include his mother’s godson and a longtime family friend, Elvis Perkins performs “While You Were Sleeping— a song that was one of his mother’s favorites from his debut record “Ash Wednesday.” Source

The legislation aims to stop social media companies from banning users based solely on their political opinions. Source

CBS News is broadcasting its coverage of the 20th anniversary of the 9/11 terror attacks in a CBS News Special Report. Source

Former CIA officials share their firsthand accounts of the 9/11 terror attacks and how the agency helped track down al Qaeda leader Osama bin Laden in the CBS News special “Race Against Time: The CIA and 9/11.” Source