A terrarium is a miniature indoor garden, often in a sealed container, that can create a self-sustaining ecosystem. Build your terrarium by layering gravel, charcoal, and topsoil in a clear container ...

TOWARD the close of a recent afternoon, we calibrated a cleaned, dry 5-gallon carboy by pouring in successive litres of distilled water. During the next morning, we found that the bottom 13 ...