He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.
Bulky and relatively heavy
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float value = fmodf(0.7548776662f * (float)x + 0.56984029f * (float)y, 1.0f);
（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。
外祖父母和子女的全家福，摄于1970年。（受访者供图）