Eric Bleeker and a partner respond to 911 calls in this vehicle. The medical team can run simple lab tests and prescribe some drugs, which may spare a patient a trip to the ER. Eric Whitney hide caption

itoggle caption Eric Whitney

Jenny Hackett walks across a street in St. Louis, Mo., on Sunday. Subzero temperatures are predicted there Monday, with bitter cold sweeping east. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP

A Boston police officer wheels an injured boy down Boylston Street as medical workers carry an injured runner after the Boston Marathon bombing in April. Charles Krupa/AP hide caption

itoggle caption Charles Krupa/AP

The bite of a cobra can paralyze its victims and, if enough venom is released, fatally stop their breathing. It's estimated that more than 75 percent of patients in India who die from a snake's bite never make it to the hospital. STRDEL/AFP/Getty Images hide caption

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Keep the soy sauce on your food, and use it in moderation. Aaron Tam/AFP/Getty Images hide caption

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SWAT team members stand guard on the campus of Massachusetts General Hospital following the explosions at the finish line of the Boston Marathon. Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP