1999年9月的一天,加拿大的一个9岁小孩救了他母亲一命,他叫丹尼尔·凯利。当他们两准备骑自行车去接丹尼尔的两个姐姐时,他递给母亲一个自行车头盔。虽然海蒂·凯利在她三个孩子骑自行车时总要让他们戴上头盔,可她自己在骑车的时候却很少戴。但是在那天下午,丹尼尔坚持要这样做。 One day in September 1999, a 9-year-old Canadian boy saved his mother’s life by calling Daniel Kelly. When both of them were ready to ride bicycles to meet Daniel’s two sisters, he handed his mother a bike helmet. Although Heidi Kelly always put them on helmets while her three children are biking, she seldom wears while riding her bike. But Daniel insisted on doing that afternoon.