This in vitro study reports that radiofrequency (RF) exposure in the 800–2,400 MHz range modulates differentiation pathways in human cortical organoids derived from embryonic stem cells. RF exposure is described as maintaining radial glia stem cell identity and delaying differentiation, alongside induction of endogenous retrovirus expression and increased expression of ASD-associated genes and retroelements. The abstract attributes these effects to dysregulation of BET proteins and reports that BET inhibition rescues the RF-associated developmental defects.