Our group made of, Prof. T. Enoto from Kyoto University, and graduate students of Bamba-Nakazawa lab, Y. Wada, Y. Furuta, together with Lectuerer K. Nakazawa, Dr. T. Yuasa of ex-RIKEN, Dr. H. Tsuchiya of JAEA, Lecturer M. Sato of Hokkaido Univ. et al., has obsevationaly discovered the existence of photo-nuclear reacations in a lightning event. Our findings is published in Nature (http://dx.doi.org/10.1038/nature24630).