There are two types of smoke alarm. One of 'em ain't so good.

Which one is better? Now that's a burning question.
Also, don't start tearing apart smoke alarms and playing with the americium. It's mostly harmless when outside your body but if it gets in there can be trouble.
Links 'n' stuff:

The 60 minutes programme;
   • The alarming truth: Part two - Karl Stefan...  

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