The Rosetta Stone, not to be confused with the language learning software, is a granodiorite stone. It was found in 1799 in Rosetta, Egypt by French scholars and sent to Napoleon.
A tycoon, also known as business magnate or mogul, is an extremely wealthy and powerful person whose fortune derives primarily from one particular industry. This can encompass anything from oil to real estate to shipping vessels, with notable examples being Aristotelis Sokratis Onassis, a shipping tycoon, and Henry Ford, the automotive tycoon.
An agent that is smaller than a virus causes scrapie. It is either a protein called a prion or it is another substance closely associated with the prion protein. Scientists still have a lot to learn about the scrapie agent and exactly how it works.