Boston Celtics player Kyrie Irving apologized on Monday for helping perpetuate the “Flat Earth” conspiracy theory, saying he didn’t realize “the power of voice.” “At the time I was huge into conspiracies and everyone has been there,” he said at the Forbes 30 Under 30 summit. “At the time, you’re innocent in it but then you see the effects and the power of voice.” He then insisted that he was a “smart ass individual” and offered an apology to science teachers. “At the time, I just didn’t realize the effect… I’m sorry about all that,” he said. “For all the science teachers, everybody coming up to me like, ‘You know I got to reteach my whole curriculum!’ So, sorry. I apologize.” Irving went on a podcast last year and discussed the “Flat Earth” theory, but the next day said he was not serious. “[A flat Earth] would be scientifically impossible, which I’m totally aware of that,” Irving told reporters at the time.