Assistance to fight off a silicon-based lifeform

I am a survivor of the United Nations Space Corp's 2nd Exploration Fleet. On our travel to the distant Epsilon Canares system, our scouts encountered a strange lifeform.

We call them 'shapeshifters'. At first contact, they looked like 6-legged crabs. After a few months, they started to mimic us and now, a year later, there is practically no visible difference between us and them. They can even speak our words now.

The only thing we know about them is that they are silicon-based lifeforms and instead of blood, they use ammonia to distribute nutrients to their cells. At first, we cut ourselves in front of each other to prove that we have blood in our veins instead of ammonia. But they copy us too fast now. I just checked my best friend two hours ago and now he's replaced with a shapeshifter. I've locked myself in the laboratory because I can't trust anyone else now.

Can anyone help me? How can I tell the difference between them and us? Is there a device I can build that scans bodies at a distance and tell me whether they're human or shapeshifter?

posted about 10 years ago

Ifree Contractors‭

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