Q: Is this a relatively new form of non-contact proximity sensing? A: Actually, it’s the oldest. As soon as photosensitive and photoconductive sensors, along with basic electrical components, were ...

1) Is there a proximity rule for there is/are? Does the subject closest to the verb is/are determine whether the verb is singular or plural? Example: “There is a banana and four apples on the ...

Currently, detecting submerged submarines with sonar or electromagnetic sensors requires relative physical proximity—but two odd properties of quantum physics could greatly increase detection range.

Have you ever wondered how speed guns measure the speed of moving vehicles or how an athlete's sprint speed is recorded? Normally these speed sensors work with radar or laser technology to bounce back ...