No, nor do they tell the truth. They perform functions as established by humans, and cannot do anything more than what they are programmed to do. Lying and truth-telling are value judgments and computers do not "think" in terms of good or bad.
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Texas Instruments came up with the first calculators in the 1970's - so, Texas.
Blaise Pascal lived long before the invention of calculators.
One can find information on annuity calculators by going to the place that provides them. Examples of places that provide annuity calculators would be Bankrate, Aviva and LifeAnnuities.
because calculators aren't clever enough and brake or get lost whereas brains don't get lost
well it is used for calculating numbers and would be useful but usually calculators are not used during exams as it is a basic rule for not using them !