Last week, I put together a piece about the rising size of iPhone screens. It was, in summary, a graph showing them getting bigger. Surprise! But as the week progressed, I thought about it a bit more ...

Back in the 1980s, Pacific Bearing Co. (PBC) invented and commercialized plain bearings, which were sized to be interchangeable with linear ball bearings. Plain bearings worked very well in certain ...

Default, conservative gear ratios. Note the smooth curve of the line connecting the ratio graph bars. Gearing ratios determine how many turns of the driveshaft result in a single turn of the wheels ...