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Draco lived in Athens during the 7 th century B.C. During this period, oral laws were used, and were under the control of the aristocratic class. This meant that the legal system was unfair, and could ...

Heart valves keep blood flowing in the right direction between the heart's four chambers. Mechanical valves last longer than bioprosthetic valves but require lifelong blood thinners. Most of the time, ...

Artificial heart valves are strong and last longer but require lifelong use of blood thinners. Biological heart valves do not usually require blood thinners but wear out over time. Hybrid heart valves ...