toxic chemicals

A friend of mine has been a volunteer firefighter for 48 years. He doesn't scare easy. He estimates that he's helped put out 500 fires, running into burning buildings some of the time. That doesn't faze him either. 

Lead is a naturally occurring element in soil, water, and air. It shows up in trace amounts in foods, including protein powders—often just 0.5 to 3 micrograms per serving.

The winner in this month s I need a chemistry lesson, and