World's fifth-richest man Warren Buffett, Chairman of Berkshire Hathaway, praised Indian-American businessman Mohnish Pabrai for the work at his Dakshana Foundation, which helps poor students prepare for IIT and medical entrance exams. "I remain incredibly impressed by what you've done, are doing and will do at Dakshana," Buffett wrote to Pabrai. In its annual report, Dakshana had quoted Buffett.