coronavirus en el mundo

[AzetSar]

Imagine having to do the work of a jackhammer using a sledgehammer or a pickaxe, and you'll quickly understand how important this one machine is to the construction industry. Concrete, asphalt and rock are hard -- sometimes really hard -- to work with. Thanks to that toughness, roads and building foundations last for decades. But when rebuilding or mining projects require removing these unyielding substances, a sledgehammer just isn't enough. That's when jackhammers come in handy. T-shaped jackhammers are among the most iconic, fearsome and ear-shattering tools on construction and demolition sites. Because they combine two fundamental human hand tools (a hammer and a chisel) in one mechanized body, they are also one of the most useful. We could always go back to the old way -- using heavy-headed sledgehammers -- but there probably aren't enough chiropractors in the world to keep construction workers' backs aligned. Plus, sledgehammers are achingly slow. Unfortunately, a gas mask won't do you much good in the event of a large-scale bioterrorist attack. The attacks of Sept. 11, 2001, alerted the world to the realities of new terrorist threats. Startling images of the Twin Towers falling are indelible. May have overshadowed the events t­hat occurred just a week later. From a public mailbox in New Jersey, letters that contained anthrax spores were mailed to two U.S. The attack killed five people. Bioterrorism -- the purposeful release of bacteria, viruses or germs to cause injury, illness or death -- became a reality in the United States. The three ways a terrorist can release biological agents is through air, water or food. These agents are typically very difficult to detect and because the illnesses they cause are usually delayed, it makes bioterrorism a hard crime to investigate. In fact, the anthrax case of 2001 remains unsolved. Human bodies infected with plague were also used as ammunition in central Europe during the 14th and 15th centuries. haaland

















































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