Incomprehensible though the transmission from Universe was to their unaided senses, it conveyed the only message that mattered.

The tiny 'bricks' of H2O were too small to be visible to the unaided senses, but they could be easily discerned by the instruments of the physicists.

And even as the thought entered his mind, his hands were released and the desk top moved back to its original position-and Trevize was left with his own unaided senses.

To every unaided sense they became identical with the exhibit.

The claimant must perceive a "shocking event" with his own unaided senses, as an eye-witness to the event, or hearing the event in person, or viewing its "immediate aftermath".

His work centers around using mathematics to understand the organization of matter in space and time, particularly at the scale observable by the unaided senses.

It was a reminder that he, Alita, and Shari were in effect lurking in the shadows of a conflict far bigger, faster, and more deadly than unaided human senses could perceive... or comprehend.

A host of natural phenomena are demonstrably true, but not observable by the unaided sense.

But -- "We can see Carleton Lufteufel with our unaided senses," he explained to Lurine.

Very few of these events were visible to the unaided senses.