In most cases there is simply no evidence that the hum people are hearing is coming from an external source.
It's important not to take criticism personally, and to settle disagreements through feedback from an external source.
Perhaps it's both or more likely they are being sneaky in pushing responsibility for unpopular decisions to an external source.
An illusion is distinguished from a hallucination, an experience that seems to originate without an external source of stimulation.
After the pellets stop being radioactive, Mr. Giuliani will receive radiation treatment from an external source, which improves long-term survival rates, his doctors said.
The body has a limit to how hot it will get, and unless it is overheated by an external source, body temperatures rarely exceed 106.
Furthermore, a recent interesting, if speculative, proposal suggests that, when driven by an external source of energy, matter will rearrange itself to dissipate this energy most efficiently.
Thankfully, there was an external source of labour to ease the pressure on the jobs market - the 'New Commonwealth' countries of the Indian subcontinent and the West Indies.
The people who hear a hum do not appear to be suffering from tinnitus, a persistent ringing in the ear that is not produced by an external source.
Passive guidance systems neither emitted energy nor received commands from an external source; rather, they "locked" onto an electronic emission coming from the target itself.
Without mirrors and a resonant cavity, a laser would just be an optical amplifier, which can amplify light from an external source but not generate a beam internally.
