> searchlights or even lasers Think about the return on investment on these: how... | Hacker News

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		falsedan on March 1, 2017 \| parent \| context \| favorite \| on: Dot Watch – A braille and tactile smartwatch `> searchlights or even lasers` Think about the return on investment on these: how much energy to grow and power vs. the improved food gathering. Also: would this make the creatures easier to find by predators? Galagos developed large eyes rather than sonar, true. I refer you to my other comment: `> Perhaps eyes convey a general advantage, regardless of how you find food?`

logicallee on March 1, 2017 [–]

I think we can all agree that my point is made, and it's easy to imagine sentient extraterrestrials without photoreceptors.

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