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GPIO pins

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millennial:
I have (probably) a simple question for Electrical Engineering experts. Why are there two rows of GPIO pins? It seems as though the mc-Module GPIO pins are doubled in count. I am assuming it would be bad to connect each of the 14 columns together by attaching a breadboard to all 28 pins because of possibly short circuiting the board?

Are there two rows so that we can output to two devices based on the state of one pin? I'm looking for 5th grader like knowledge.

millennial:
Two pictures are worth 2000 words. Is this a bad idea?

The pins are in rows i and j, and columns 1-14.

mc-Josh:
You are correct, the pins directly across from each other are duplicated (pins 1 and 2 are 3V3, pins 3 and 4 are PIN0, pins 5 and 6 are PIN1, and so on). As long as you only connect the pins with the same signal together (pin 3 to pin 4 for PIN0) you will not have any problems.

millennial:
Great, makes sense. Thank you.

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