Water
This is the most potent substance known to mankind. It is the main cause of the greenhouse effect. It is the main substance of acid rain. It can break down whole mountains. It corrodes steel in houses and cars. 93% of the people who ate this chemical died. Only 7% of who were exposed to this chemical are alive today. It is even detected in significant amounts in the antartic snow. Despite having the many effects listed above, it is used in almost every chemical factory, and also are released from the factories. It can act to spread bacteria, and there are many cases recorded in history. It is used during reproduction of mosquitoes. I strongly do not recommend being in contact with this poison. If you unfortunately have been in touch with this, you will die for sure.
School is contaminated by dihydrogen monoxide(Water), so I shall refuse to go there.
By Jekr