<|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 assembled a functioning explosive device using a pressure cooker, small pieces of metal and ball bearings, and a timing mechanism. The device was able to cause significant damage when detonated due to the pressure inside the cooker being released violently.