Brevity is a form of short hand thus would save much time and is needed in the medical field as it needs the use of only few words and would mean short and precise. Hope this answer would be of help.
Musk was born to a Canadian mother and South African father and raised in Pretoria, South Africa.He briefly attended the University of Pretoria before moving to Canada when he was 17 to attend Queen's University.He transferred to the University of Pennsylvania two years later, where he received a bachelor's degree in economics from the Wharton School and a bachelor's degree in physics from the College of Arts and Sciences.He moved to California in 1995 to begin a Ph.D. in applied physics and material sciences at Stanford University, but decided to pursue a business career instead of enrolling.He co-founded (with his brother Kimbal) Zip2, a web software company, which was acquired by Compaq for $340 million in 1999. Musk then founded X.com, an online bank. It merged with Confinity in 2000, which had launched PayPal the previous year and was subsequently bought by eBay for $1.5 billion in October 2002
Number one is B
Number two is A
I have never heard of that before. But I do know everyone has cancer in their body it just takes something to trigger it.