CONTENTS 1
CHAPTER 1
1．The Secret School 1
2．The Tower of Chairs 8
3．A Gold Medal 18
4．The Floating University 28
5．A Letter from Bronya 37
6．The Great Adventure 48
7．“First in Order of Merit” 55
8．Baby Irene 65
9．An Exciting Discovery 74
10．Radium！ 82
11．An Important Decision 92
12．A Penny for Irene 101
13．“I Will Try” 109
14．A Dream Comes True 117
15．“Little Curies” 126
16．A Gift from America 134
17．The Rose Vine 142