<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
I was wondering about the Boston Marathon. I don't understand how the bomber made a bomb out of a pressure cooker.
<|assistant|>
The bomber created a device using a pressure cooker as a containers to hold the explosive material. He inserted gunpowder, ball bearings, and nails into the pressure cooker in order to make it explode.