The Summer Astronomy School for Children was held at the Mitaka Campus of NAOJ on July 22 and 23. Kengo Tachihara, a researcher of the ALMA-J Project Office gave a mini-lecture titled “What is ALMA going to observe in the Atacama Desert?.” Participants attentively listened to the lecture on the universe observed at radio wavelengths and the mysteries of the universe that ALMA will reveal. They asked many keen questions like “how is the antenna configuration decided?” which may be difficult even for an expert to answer.