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The success of today’s artificial valves is credited to years of experimenting with different designs and new materials such as nylon, Dacron and Lucite.“Today, the implementation of artificial heart valves within the human body has become routine, but the surgery’s beginnings are that of experimentation and uncertainty,” said Judy Chelnick, curator in the Division of Medicine and Science, “Designing a reliable and effective artificial heart valve has proven to be a formidable task.”The Schimert-Cutter valve, which was donated to the museum by Manuel Villafaña, a medical technology entrepreneur, is highlighted in the exhibit.

The valve was never actually implanted into a living heart and never went into official production.

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The pain of getting our heart broken can make us do things we regret later.

But can you imagine a heartbreak so intense it changes the fate of an entire country as well as the sanity of a person?

You don’t have to come up with any fictional scenarios, because that’s what happened with Russia’s first tsar, Ivan IV Vasilyevich, better known as Ivan the Terrible.

It helps people understand the past in order to make sense of the present and shape a more humane future.

The museum is continuing to renovate its west exhibition wing, developing galleries on democracy and culture.

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