If I had known that I would travel through time, I would have googled the production methods of those gunpowder and glass... Jiang Zhe looked at the big tree in front of the door and sighed, and said unconfidently, glass, um, must have been burnt by sand , What about gunpowder, saltpeter, black charcoal? Sulfuric acid or sulfur? Husband...Xiu'er walked up to Jiang Zhe and asked strangely, isn't your husband going to work? Zhe shook his head and walked away, working so hard for those few hundred pennies... Desperately... "Zhe Zhe" zero group: 34375614 (full) "Zhai Xing" group: 87817071 (full) book friend Xianyuan nothingness The second group of "Zhai Xing": 12158910 (full) provided by book friend Death and Fengjun! The third group of "Zhai Xing": 97474881 (full) book friends don't care about my friendship! The fourth group of "Zhai Xing": 104143590 book friend Long Provided in friendship by Zhi Xueshang! Five groups of "Zhai Xing": 114668942 book friend lost in friendship provided by YANG!