The following are stories and questions about them. Each story is followed by a question and answer to a given question.

Story: Bill & Melinda Gates Foundation (or the Gates Foundation, abbreviated as BMGF) is the largest private foundation in the world, founded by Bill and Melinda Gates. It was launched in 2000 and is said to be the largest transparently operated private foundation in the world. The primary aims of the foundation are, globally, to enhance healthcare and reduce extreme poverty, and in America, to expand educational opportunities and access to information technology. The foundation, based in Seattle, Washington, is controlled by its three trustees: Bill Gates, Melinda Gates and Warren Buffett. Other principal officers include Co-Chair William H. Gates, Sr. and Chief Executive Officer Susan Desmond-Hellmann. 

On June 25, 2006, Warren Buffett (then the world's richest person, estimated worth of US$62 billion as of April 16, 2008) pledged to give the foundation approximately 10 million Berkshire Hathaway Class B shares spread over multiple years through annual contributions, with the first year's donation of 500,000 shares being worth approximately US$1.5 billion. Buffett set conditions so that these contributions do not simply increase the foundation's endowment, but effectively work as a matching contribution, doubling the Foundation's annual giving: "Buffett's gift came with three conditions for the Gates foundation: Bill or Melinda Gates must be alive and active in its administration; it must continue to qualify as a charity; and each year it must give away an amount equal to the previous year's Berkshire gift, plus an additional amount equal to 5 percent of net assets. Buffett gave the foundation two years to abide by the third requirement." The Gates Foundation received 5% (500,000) of the shares in July 2006 and will receive 5% of the remaining earmarked shares in the July of each following year (475,000 in 2007, 451,250 in 2008). In July 2013, Buffet announced another donation of his company's Class B, this time in the amount worth $2 billion, is going to the Bill and Melinda Gates Foundation.

Question: What is the name of the foundation this article is centered around?
Answer:Bill & Melinda Gates Foundation

Question: what is the shortened name?
Answer:BMGF

Question: who founded the foundation?
Answer:Bill and Melinda Gates

Question: When did it launch?
Answer:2000

Question: how much was Warren Buffet worth in 2008 approximately
Answer:US$62 billion

Question: as of what day?
Answer:April 16, 2008

Question: how much did he pledge to BMGF
Answer:10 million Berkshire Hathaway Class B shares

Question: at one time?
Answer:no

Question: what was the first year's contribution?
Answer:500,000

Question: worth how much?
Answer:US$1.5 billion

Question: how many conditions were there for buffet's contribution?
Answer:three

Question: How long did Buffett give for the third condition to be met?
Answer:two years

Question: what year did he announce another donation?
Answer:2013

Question: what month?
Answer:July

Question: worth how much?
Answer:
$2 billion