There are 4 pairs of 2 wires, for 8 overall. They are all used, but the pairs are redundant. From what I understand, when you send a positive pulse on, say, the solid blue wire, you also send a negative pulse on the stripy blue and white wire. The twisted pairs should counteract any interference, but if it doesn’t, the arrival of the bumps with opposite polarity should foolproof things a little.
Oh yeah it’s called differential signalling.





Still waiting, BTW.
From what you’ve posted so far, you would have failed my 9th grade English class’s section on writing arguments. Subject, Example, eXplanation, and why this matters to You. I guess this is what happens when a generation is raised by iPads and then school is canceled for 2 years hahahaha…