Though it's generally safe to use in other ways, aluminum foil wasn't designed to come into close contact with the heat source at the bottom of your oven.
Orphan wells pose significant environmental and health risks, as they can contaminate water sources with toxic substances such as methane, benzene, and other harmful chemicals.
Because ground beef is susceptible to harmful bacteria, it's important to educate yourself on the proper techniques for freezing, thawing, and refreezing.