Himring writes: Today marks the 30th anniversary of the single most significant event, to date, that points to possible evidence of ETI. On this day in 1977, Dr. Jerry R. Ehman circled data retrieved from the "Big Ear" radio telescope of the Ohio State University Radio Observatory. The telescope has since been destroyed, and although other, modern telescopes have tried (such as the VLA) none of have successfully reproduced the results of that day. By and large, all possibilities of an earth-based signal causing the event have been ruled out as well as any possible natural phenomenon. Still, Dr. Ehman has remained reserved and stated that he doesn't want to draw, "vast conclusions from half-vast data." Here is the link to Dr. Ehman's 30th Anniversary Report.