After numerous experiments, Tang Wanwan confirmed that there are four herbs in this poison that are quite common, but only one crucial ingredient called Crimson Grass. This grass has a significant characteristic: it prefers to grow in acidic soil conditions. Tang Wanwan remembers that red soil is acidic, but it's not guaranteed to have this grass—it needs to be verified with medical books to be certain.
Tang Xiao Yi and Han'er are still children. After the bones killed the ants with poison, there was nothing fun left to do. Brother Lu and sister were both in the room studying medical books, and the two little ones began to yawn. Tang Wanwan heard their yawns and realized the two little ones were tired.
Luckily, they weren't scared at all, watching with great interest. Tang Wanwan explained to Tang Xiao Yi that to trace the exact source of the poison, continuous experiments are necessary, followed by verification. Tang Xiao Yi nodded vigorously, taking it all in.
