Instead of throwing those egg shells in the trash put them in your garden. Egg shells has valuable nutrients such as calclum that is added to the soil. Before putting egg shells be sure to wash and crush them. Crushing the egg shells will help them to break down more quickly. If you only have house plants the egg shells can be added to the bottom of the pots before adding the soil. You can also put the crushed egg shells around the plants stems. Like coffee grinds which put nitrogen in the soil, egg shells put calclum in the soil. Both are good for those vegetable plants like tomatoes and peppers even though many other vegetables can benefit from the egg shells and coffee grinds. Coffee grinds and egg shells can help keep those cutworms and slugs away from your plants. So recycle those egg shells and coffee grinds.