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TODAY IN HISTORY

    AMERICA'S FIRST ASPHALT PAVEMENT
    July 29, 1870

    Was laid in Newark, N.J. Previously, coal tar was used for many pavements laid in the 1860s. The first recorded asphalt pavement in the U.S. was a sand mix placed in front of the City Hall in Newark, N.J., in 1870. Edmund J. DeSmedt, a Belgian chemist (who became the inspector of asphalt and cements for the District of Columbia) held a U.S. patent for this asphalt paving method, granted on 31 May 1867. In that century most roads, even in cities, were wide dirt pathways, severely affected by weather. Smooth surfaced asphalt roads originally were for the benefit of bicyclists. By 1904, only 141 miles were surfaced, but commonplace by 1916. Natural asphalt deposits were originally used, but almost all of the asphalt used commercially is now made from petroleum.

    THE FIRST IRON LUNG
    July 29, 1927 - United States

    (Electric Respirator) was installed at Bellevue hospital in New York for the post war polio epidemic. The first iron lung was developed at Harvard University by Phillip Drinker and Louis Agassiz Shaw built with two vacuum cleaners. The iron lung is a negative pressure machine which surrounds the patient's body except for the head, and alternates a negative atmospheric pressure with the ambient one, resulting in rhythmic expansion of the chest cage (and thus inhalation) in response to the negative extra thoracic pressure. During periods of ambient extrathoracic pressure, the lungs deflate. This type of machine is rarely used today.

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Electric Cars for Kids What to Look for :

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Electric cars for kids aren't just fun and exciting to ride but also give the little ones a perfect opportunity to develop hand-eye coordination as they learn to steer, start, stop and accelerate their motorized vehicle. Most of the electric ride-on cars are made with realistic racing sounds and working headlights.

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Electric cars for kids aren't just fun and exciting to ride but also give the little ones a perfect opportunity to develop hand-eye coordination as they learn to steer, start, stop and accelerate their motorized vehicle. Most of the electric ride-on cars are made with realistic racing sounds and working headlights. Some of these toys are even able to reach speeds in the region of 5-mph, but still perfectly safe for kids aged 2 or 3 to ride.

Here are some of the main points to consider when shopping for a motorized ride-on car -

Style of Ride-on Toys - Firstly, the electric ride-on cars are either styled on cars seen in movies, such as the Lightning McQueen from the Cars 2 movie or replicas of real cars, such as the Jeep, Mustang and Ferrari, which are scaled to a miniature size for kids aged 1 to 7 years old. Ride-on cars are built with controls which are intended to be similar in style to the real thing and easy to use. These toys are solidly built, although as the body of the car is made of plastic, one or two good bumps into a wall or similar solid object could easily cause significant damage.

Motor Power - engine size for the different ride-on toys various from vehicle to vehicle, with the engines powered by either a 6 or 12-volt battery. Cars equipped with a 6-volt battery are often designed for the toddlers, aged 1 to 2 years old, and travel at speeds of up to 1.5-mph. While the 12-volt powered cars are more suited to kids aged 2 years plus, and run at speeds of 2 to 5-mph. Also, in relation to the power, it is important to consider the battery charge time, which should be able to last for at least a good 2 or 3-hours. You can however order a spare rechargeable battery to give extra playing time if required.

Dual Controls - many of the latest models of ride-on toys now offer a dual control option. Manual control is just for the kids to steer, accelerate, reverse, and stop and have complete control of the car in their hands. While a car with a remote control unit is perfect for the parent that wants to maintain some sort of control over the vehicle. If preferring to have parental control than buy one of the ride-on cars with manual / remote control.

Ride Surface - the chosen type of car is also dependent on the where the electric car is going to be used; some of the smaller versions are more practical for using inside the home, so perfect to offer complete security and safety for the youngsters. While a larger-sized ride-on car might be designed for outdoor use and runs freely on either hard-surfaces, such as concrete driveways or paths or soft surfaces, such as grass or even sand.



Source : EzineArticles

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