This month BIPM (the organization that manages SI units) has released a new version. This version replaces the measurement standards that are based upon “artifacts” with standards based upon known constants. The artifacts have been observed to change over certain periods of time and, as a result, can not be Read more…
I purchased a 3.7V cellular battery from an Amazon supplier a few months ago. Red = positive and black = ground, correct? Sure. A couple weeks afterward the company threw away an $85 modem board. Cause of failure: the battery leads had reversed polarity. A few days ago I took Read more…
This week I needed to use some screws for an outdoor project. Initially I chose to use door hinge screws because I had a bunch of them on hand. After I thought about it some, I decided to purchase self-tapping zinc-coated screws under the impression that these would not be Read more…
I just got bit by an apparent bug somehow related to Python 3.7 and TensorFlow 1.12.0 and 1.3.1 running on Raspberry Pi ARM processor: The python distribution was installed on a RPI 0W from source, then tensorflow from Pip. Another user reported the same error with a RPI 3 on Read more…
Today someone told me that the application of PVC primer prior to the application of PVC cement is not necessary since the pipe will not be used for liquid transport. Is this true?The PVC cement instructions call for the application of primer, but provides no amplification on such conditions where Read more…