It’s Thursday, January 17th. John Bogle, the man who launched the mutual fund company Vanguard, died Wednesday. He was 89. Bogle revolutionized the way Americans save for the future. He championed the interests of small investors, and railed against corporate greed and the excesses of Wall Street. His Malvern-based company pioneered low-cost, low-fee investing and mutual funds tied to stock-market indexes. These innovations helped millions buy homes, pay for college, and retire comfortably.