More Notable Events on June 25: 2006 Warren Buffett donates $30 billion to the Bill and Melinda Gates Foundation 1997 Christies auctions off Princess Di's clothing for $5.5 million 1981 Supreme Court upholds male-only draft registration, constitutional 1942 General Dwight Eisenhower appointed commander of U.S. forces in Europe 1929 President Hoover authorizes building of Boulder Dam, Hoover Dam