Here is a close look at the common- versus differential-mode voltage and instrumentation amplifier (IA) topologies.

MISSOULA (AP) — A Ronan man who a judge said used a developmentally disabled man as a ‘‘weapon’’ to kill two people in a robbery plot was given two life sentences without the possibility of parole.

Finally today... Hundreds of readers wrote in to share their stories of long-term sickness forcing them out of work after Money feature writer Brad Young looked into the trends driving the crisis. He ...