The other reason is that we authors have dealt
with the related topic in the past. Then the students
were at the secondary education level. Even though
the students for this project were elementary school
students, we could utilize the know-how and
experiences in the past for this current project.
In this project, the lecture was carried out in
Metaverse (Second Life). The teacher used a power
point file for his lecture on second life. Fig.1 shows
the second slide of the lecture file. Radioactivity
exists even in nature, even though the place might
be far away from any nuclear plants. This slide
showed children the truth very easily