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...openings through which blood enters the chambers prevents it from flowing in the reverse direction. The resting heart rate varies between individuals. During exercise or in response to stress, the heart rate increases. A condition where an individual has a chronically low heart rate is called bradycardia, which can be a sign of potentially serious illness. Conversely, an...

...Open University's Computing and IT courses. [Ada Lovelace] Who was Ada Lovelace? I would have bought and sent a card if only Clintons carried them. Ada Lovelace Day has been set up to commemorate the important role of women in technology. It wouldn’t be surprising if you haven’t heard of Augusta Ada King, Countess of Lovelace, who must be considered the World’s...