Carry propagation — threading carry information across positions
In the 1950s, legendary behaviorist B.F. Skinner debuted his version of a “teaching machine,” based on the 1924 invention of Ohio State University psychology professor Sidney Pressey. The contraption was loaded with a piece of paper with questions, and students pressed keys indicating the correct answer, at which point another question would appear. Both Pressey and Skinner ran into similar problems, though, failing to implement the technology in schools. Educators weren’t convinced of the machine’s benefit, which prioritized individually paced learning not conducive to students of the same age moving through a grade level at the same time.
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（二）实际承运人，是指接受承运人委托或者转委托，实际履行本法第四十九条规定的全部或者部分承运人义务的人。
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Results are compared to iPad Air (5th generation) units with 8-core CPU and 8GB of unified memory.