“Invest the money in a trust and have most of the interest earned payed out to a charity. Have the target charity rotated annually. Research charities and select those with low management overhead. Inform the charity that the monthly donation is for one year to avoid expectations of continual funds. Ensure the principal cannot be accessed and that the fund is managed with low overhead. Set the trust up such that it can reasonably be expected to last 100 years or so. Specify what to do if the fund drops below some floor or exceeds a ceiling. Create a poison pill such that any attempt to access the principal liquidated the funds to a number of charities.”