I hope this post isn't off topic, and if it is I sincerely apologize. Many of you have looked at my name and wondered "What is a Spirogyra, much less a killer one?" A spirogyra is a type of freshwater algae, Gamophyta Spirogyra. They are better known as pond scum. They have a very complex reproductive process which has not been fully procured. However, it basically goes that a little bit of the adult spirogyra breaks off and grows. Sometimes two spirogyra come together and a zygote forms between them. This becomes a new spirogyra. Spirogyra are long and tubelike with spiral-shape chloroplasts(the part that turns sunlight into food). Now what is a killer spirogyra? These creatures seem more or less harmless. And they are harmless, because they have no means of harming any other creature except for one fact shared by everything in existance - they occupy space and the space occupied by a spirogyra can't be occupied by anything else. Therefore, it is a simple job of making them multiply until they clot a major artery to become killer. This is done by exposing them to small doses of antibiotics until they become resilient to them. The only other substance that can possibly harm them is alcohol, but that would have to be consumed in such quantities as to enable brain death. The only other catch is that to successfully introduce them into somebody's system, they would have to be a) consumed, b) injected, or c) placed on an open wound. The second is the least plausible, because what fool wouldn't notice being injected with pond scum? The first one isn't much better, because they would have to be eaten in very large doses which would be next to impossible to hide unless the fool was in the knowledge he was eating pond scum and accepted it. The last choice, even though it is the best, is pretty sad. You'd have to be an idiot (no disrespect to idiots) to not realize that the gauze on your cut was an unhealthy shade of green. Thanks for getting this far, you'd have to be a mad scientist or just an extremly bored person to read all of this.