伽利略是意大利著名的物理学家、天文学家。他有名的“比萨斜塔”实验，推翻了亚里斯多德的“落体的速度与落体的重量成正比”这条被人们遵守了千百年的定律，成为近代物理学的开创人。可是，你知道吗，伽利略年轻时曾一度想当修道士，这位科学家的天才差点被埋没在修道院里呢！帮助伽利略及时改变这个主意的，就是他的父亲凡山佐。
凡山佐是一位琵琶演奏员和作曲家，但他没法靠音乐为生，便开了一个小商店，生活过得很贫寒。凡山佐擅长数学，但那个时候的意大利，人们并不了解数学的用处，连大学都没有专职的数学教师。在这种情况下，凡山佐不愿意儿子学音乐，也不愿意儿子学数学，他希望儿子长大以后能成为一名医生。伽利略这个名字就是为了纪念他们的祖先，请一位著名的医生给起的。
为了能使伽利略进大学，凡山佐把孩子送到游论勃罗萨修道院办的一所学校去学习。那时欧洲的教育、科学都是神学的奴仆，许多学校都是附设在修道院里。伽利略在学校受到宗教熏陶，几年的耳濡目染，使他感情冲动，决心要当一名修道士，把一生贡献给上帝。
当时在人们眼里，修道士是一个高尚的职业，为上帝献身，这种精神更是可贵的。可伽利略的父亲凡山佐得知这个消息后，坚决不同意。他知道，伽利略是个爱思索的孩子，从小对任何事物都喜欢问一个为什么。记得有一年冬天，他带伽利略去朋友家作客，当时气候异常寒冷，天上飘着鹅毛大雪，街上、房顶上都是白茫茫的一片。小伽利略非常高兴，跟在父亲后面，一边蹦着，一边唱着歌。忽然，他停住了脚步，望着漫天飞舞着雪花，问：“爸爸，为什么春夏秋天下雨，冬天却下雪呢？”
“冬天气候寒冷，雨在空中凝聚成雪花才落下来呀！”
“那，雨水没有颜色，雪花为什么都是洁白的呢？”小伽利略沉思片刻，又追问爸爸。爸爸被问住了。
凡山佐认为，像伽利略这样思想活跃、敏捷的孩子，以后是不会长期甘愿接受宗教教条束缚的；修道院中枯燥、令人窒息的生活，伽利略也会忍受不了。他把伽利略从修道院带回家，对他进行了耐心劝说。
终于，伽利略有所省悟，他接受了父亲的忠告，改变了原来的糊涂念头，进比萨大学当了医科学生。
伽利略在比萨大学读书时，认识了一些数学家。他对自然科学十分感兴趣，开始观察和研究一些天文和物理现象，从此走上了科学研究的道路。
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