Forty years ago to the minute when this new special is televised nationally, President Richard M. Nixon took to the air waves – at 9 p.m. ET on August 8, 1974 – to announce his resignation. To mark the occasion, Dick Cavett looks back, presenting vintage interviews he conducted then about Watergate, with both the investigators (e.g., Howard Baker) and some of the witnesses (e.g., John Dean). Just looking back on it again, I can’t help but think: What an amazing time I lived through! But doesn’t everyone, at whatever age, think that? Check local listings.