Question 1
The conclusion of "No Toshiba computers are unreliable, for we've studied Toshibas for years and never found an unreliable one" is
◦ No Toshiba computers are unreliable
◦ We've studied Toshibas for years
◦ We've found an unreliable Toshiba computer
Question 2
The conclusion of "Penobscot Williams, the new star of television's "You Guessed it Right!" either has a knack for picking weak products to pitch, or manufacturers seek him out to lend credibility to products that could use some promoting. But the latter is certainly not the case. Therefore, he has a knack for picking weak products to pitch" is
◦ Penobscot Williams, the new star of television's "You Guessed it Right!" either has a knack for picking weak products to pitch, or manufacturers seek him out to lend credibility to products that could use some promoting
◦ The latter is certainly not the case
◦ He has a knack for picking weak products to pitch
Shooting star
Yellow Star Grass
Proper Motion of Barnard’s Star
A Binary Star System
The Structure of an Old Low-Mass Star
Mass Loss by a Supermassive Star