3 ms·

edit: lol ok HN hates thought experiments, got it.

throwaway894345 6y ago
It takes light 33ns to travel from a cheetah to a gazelle 10 meters away. The time it takes the gazelle to process and react to that information takes many orders of magnitude longer, so optimizing or even eliminating that 33ns isn’t going to affect the gazelle’s chances of survival. The bottleneck is never the speed of the photons.
- morelisp 6y ago
  fuckin nerds
  - tsimionescu 6y ago
    > I mean yes in our world, but also no, the bottleneck if the universe is literally the speed of photons. Not literally, no. The bottleneck is the speed of things with 0 mass, of which the photon is just one example (as far as we know). I also think it's very likely that, had there been another force that was ubiquitous but carried by a particle that traveled at 200 km/h, that would be easier to detect than photons or happened to have other favorable properties, we could have easily evolved to detect that instead.
    - deleted 6y ago
      [deleted]
  - throwaway894345 6y ago
    > edit: lol ok HN hates thought experiments, got it. > fuckin nerds I don't know man, you proposed a thought experiment, we engaged with it. Doesn't sound like HN hates thought experiments, nor that we're particularly nerdier than you (and I've engaged with you enough in the past to know that you're delightfully every bit as nerdy as I am :) ).
- kbelder 6y ago
  Evidence: The usefulness of ears.
kadoban 6y ago
The latency caused by the speed of light around us is so tiny as to be irrelevant. Our reaction times are far greater than the time it takes the light to get to us from anything that could affect us quickly (anything we can eat or that could eat us). If there were another similar-but-faster thing out there, even if it were thousands/millions/infinity of times faster it would give no real advantage. This feels like basically Amdahl's Law applied to fight-or-flight timing. Human reaction time is ~0.25 seconds. Light from even 100 meters away takes 300 nanoseconds to get to you. Those are ~6 orders of magnitude off. If light were millions of times slower, this would stop being true (but then physics wouldn't work anything like the same either, so the point is a bit moot).
- JackFr 6y ago
  Which gives me another opportunity to hype “Dragon’s Egg” a novel by Robert Forward. From the synopsis in Wikipedia: “Dragon's Egg is a 1980 hard science fiction novel by Robert L. Forward. In the story, Dragon's Egg is a neutron star with a surface gravity 67 billion times that of Earth, and inhabited by cheela, intelligent creatures the size of a sesame seed who live, think and develop a million times faster than humans.”

It takes light 33ns to travel from a cheetah to a gazelle 10 meters away. The time it takes the gazelle to process and react to that information takes many orders of magnitude longer, so optimizing or even eliminating that 33ns isn’t going to affect the gazelle’s chances of survival. The bottleneck is never the speed of the photons.

morelisp 6y ago
fuckin nerds
- tsimionescu 6y ago
  > I mean yes in our world, but also no, the bottleneck if the universe is literally the speed of photons. Not literally, no. The bottleneck is the speed of things with 0 mass, of which the photon is just one example (as far as we know). I also think it's very likely that, had there been another force that was ubiquitous but carried by a particle that traveled at 200 km/h, that would be easier to detect than photons or happened to have other favorable properties, we could have easily evolved to detect that instead.
  - deleted 6y ago
    [deleted]
- throwaway894345 6y ago
  > edit: lol ok HN hates thought experiments, got it. > fuckin nerds I don't know man, you proposed a thought experiment, we engaged with it. Doesn't sound like HN hates thought experiments, nor that we're particularly nerdier than you (and I've engaged with you enough in the past to know that you're delightfully every bit as nerdy as I am :) ).
kbelder 6y ago
Evidence: The usefulness of ears.

kadoban 6y ago

The latency caused by the speed of light around us is so tiny as to be irrelevant. Our reaction times are far greater than the time it takes the light to get to us from anything that could affect us quickly (anything we can eat or that could eat us). If there were another similar-but-faster thing out there, even if it were thousands/millions/infinity of times faster it would give no real advantage. This feels like basically Amdahl's Law applied to fight-or-flight timing. Human reaction time is ~0.25 seconds. Light from even 100 meters away takes 300 nanoseconds to get to you. Those are ~6 orders of magnitude off. If light were millions of times slower, this would stop being true (but then physics wouldn't work anything like the same either, so the point is a bit moot).

JackFr 6y ago
Which gives me another opportunity to hype “Dragon’s Egg” a novel by Robert Forward. From the synopsis in Wikipedia: “Dragon's Egg is a 1980 hard science fiction novel by Robert L. Forward. In the story, Dragon's Egg is a neutron star with a surface gravity 67 billion times that of Earth, and inhabited by cheela, intelligent creatures the size of a sesame seed who live, think and develop a million times faster than humans.”