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Ripper excavation involves using a ripper attachment on an excavator to break up hard ground, rock, or tough materials. This heavy-duty tool typically features a single robust tooth that penetrates and fractures dense materials, making subsequent excavation easier and more efficient. Ripper attachments are particularly useful for dealing with compacted soil, rock, and frozen ground, increasing productivity and reducing wear on the excavator. They are versatile tools used in various construction,

How did Jack the Ripper evade capture as he stalked the streets of London? The Missing Evidence looks at the case and uncovers new clues that point to his identity: http://bit.ly/2ptVCQp | Smithsonian Channel Aviation Nation