Reports of the dimming of the star KIC 8462852 have been debunked, causing SETI to revise its claims to have proven the existence of extra-terrestrial intelligence. The news also caused a crash in Appalachian coal futures, as CO2 sequestration speculators cancelled orders.
One insider, speaking anonymously to avoid being labelled as a “Koch-head,” revealed “when my employers were convinced that no earthly engineering team could dig an ocean through the Rockies, they were hoping that the ETs would do the work in the course of removing the sub-surface CO2 stockpiles they were hoping to establish in New Mexico and Arizona. No ETs, no CO2 sequestration, no last-grasp strip-mining in Appalachia. Oh well, there’s always that land trade for the Panama Canal!”
More seriously: it turns out that the original study of KIC 8462852, drawing upon analysis of old photographic plates, had failed to account for differences in the equipment used to capture the pictures. By comparing the apparent brightness of KIC 8462852 to that of other stars in the plates, it was determined that the the relative brightness had not changed.
Systematic effects (related to the design of the experimental system) were also a large factor in fueling the “cold-fusion” hype that I got involved in debunking back in the ’80s.