The branch of knowledge that deals with the creation and use of technical means and their interrelation with life, society, and the environment, drawing upon such subjects as industrial arts, engineering, applied science, and pure science.

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Harvard Architecture: How did Harvard Mark I separate data and instruction?

How did Harvard Mark I separate data and instruction? I have read the article in Wikipedia but I didn't understand how data and instruction was separated using a punched paper tape. It said ...
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Did cakes exist before the discovery of sodium bicarbonate?

I recently learned that baking soda (sodium bicarbonate) was only discovered in the 19th century, which made me wonder - did cakes as we think of them exist before that?