Scientific American (informally abbreviated SciAm) is an American popular science magazine. Many famous scientists, including Albert Einstein, have contributed articles in the past 170 years. It is the oldest continuously published monthly magazine in the United States(though it only became monthly in 1921). 

"Scientific American" was founded by inventor and publisher Rufus M. Porter in 1845 as a four-page weekly newspaper. Throughout its early years, much emphasis was placed on reports of what was going on at the U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 device for buoying vessels by Abraham Lincoln, and the universal joint which now can be found in nearly every automobile manufactured. Current issues include a "this date in history" section, featuring excerpts from articles originally published 50, 100, and 150 years earlier. Topics include humorous incidents, wrong-headed theories, and noteworthy advances in the history of science and technology. 

Porter sold the publication to Alfred Ely Beach and Orson Desaix Munn a mere ten months after founding it. Until 1948, it remained owned by Munn & Company. Under Munn's grandson, Orson Desaix Munn III, it had evolved into something of a "workbench" publication, similar to the twentieth-century incarnation of "Popular Science".
When did SciAm become a monthly publication?
Who famously contributed to the magazine?
Anyone in particular?
Who was it founded by?
When?
Was it sold soon thereafter?
To whom?
How long after it was founded was it sold?
What did it emphasize early on?
What section is included in current issues?
What kinds of articles does it publish in this section?
1921
It is the oldest continuously published monthly magazine in the United States(though it only became monthly in 1921). 

Many famous scientists,
Many famous scientists, including Albert Einstein, have contributed articles in the past 170 years.
Albert Einstein
Many famous scientists, including Albert Einstein, have contributed articles in the past 170 years
Rufus M. Porter
"Scientific American" was founded by inventor and publisher Rufus M. Porter in 1845 
1845
"Scientific American" was founded by inventor and publisher Rufus M. Porter in 1845
yes
Porter sold the publication to Alfred Ely Beach and Orson Desaix Munn a mere ten months after founding it
Alfred Ely Beach and Orson Desaix Munn
Porter sold the publication to Alfred Ely Beach and Orson Desaix Munn 
ten months

Porter sold the publication to Alfred Ely Beach and Orson Desaix Munn a mere ten months after founding it.
reports of what was going on at the U.S. Patent Office.
 Throughout its early years, much emphasis was placed on reports of what was going on at the U.S. Patent Office. 
"this date in history"
Current issues include a "this date in history" section
excerpts from articles originally published 50, 100, and 150 years earlier.
 "this date in history" section, featuring excerpts from articles originally published 50, 100, and 150 years earlier.