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  1. I

    Can't remember the show but it said memories are stored in DNA

    I don't see that the latter follows the former. A paintbrush is a necessary part of the normal painting process. The painting process has a definite effect on the paintbrush, via the build up of paint on the bristles and color mixing, which in turn contributes to the nature of the painting. But...
  2. I

    Can't remember the show but it said memories are stored in DNA

    I am definitely neither a biologist nor a chemist, but... I read this abstract as saying three things. The expression of Gadd45b limits the (mouse) brain's memory abilities and synaptic plasticity. Expression of Gadd45b is induced through the use of the brain, creating a regulatory...
  3. I

    robust cryptography

    Things I will not be thinking as the fireball from a nuclear detonation envelops my house: "Oh no, my laptop!" :P
  4. I

    robust cryptography

    Short discussion of lifetimes of optical media Looks like they ballpark 20-200 years depending on type of media. That assumes "correct" storage. There's a NIST paper out there somewhere that goes into more detail about humidity levels, light levels, etc. Edit: Here it is. It's dated back...
  5. I

    how hot a temp can space handle?

    Don't be obtuse. The OP's question reflected a lack of understanding of the meaning of temperature. My comment addressed why humans often have trouble imagining temperature in space; we're wired to think of temperature as some object's response (such as our body), not as an abstract measure of...
  6. I

    Math question

    Depending on the context, there are two different ways to think about scaling with percentages. The first method is the multiplicative method. This is the method used by the "scale" command in most computer graphics programs, like Photoshop. You provide a percentage and the new image is that...
  7. I

    how hot a temp can space handle?

    I find temperature in space to be a tricky thing to imagine. To me, temperature means "will I feel hot and sticky or cold and shivery?" That's a subjective feeling that comes from my body's physiological response to internal temperature. When DrPizza says that a quasar can get up to 10^6 K...
  8. I

    (How) Do divining rods work?

    This is what we call an observation, not evidence. An individual observation can be accurate, inaccurate, misleading, or flat-out fake. To weigh the value of somebody's observation we have to weigh the strength of their personal testimony, compare their observation to the body of validated...
  9. I

    Can't remember the show but it said memories are stored in DNA

    Through the Wormhole with Morgan Freeman? Edit: Maybe it was this episode, , entitled "What Makes Us Who We are"?
  10. I

    A magnetar meets a black hole

    No wonder my watch is slow... I've been setting it by G2 for years!
  11. I

    Can't remember the show but it said memories are stored in DNA

    I'd be interested in hearing about this too. I could imagine that the construction of a spider's webs might improve over time in accordance with physical growth (strength, endurance) of the spider, but I wonder if the design improves as the spider becomes more familiar with the target prey...
  12. I

    How much faster can single-core CPUs be

    Yes - an important distinction; I was being sloppy. I'll try to clarify this for people interested in the OP's question. In a CPU, binary signals are represented by voltage levels. The clock signal is a square wave at a particular frequency: it's a signal that alternates between 0 and 1, or...
  13. I

    (How) Do divining rods work?

    Well it's splitting hairs, but in psychology you are typically studying a subject's behavior under various conditions. The subject's observations are some of those conditions, which must be controlled appropriately. Once the experiment is properly controlled, the presence of an outside observer...
  14. I

    (How) Do divining rods work?

    That's not how science works. A watched pot actually does boil. Physical phenomena do not stop working just because somebody cares whether or not it works.
  15. I

    How much faster can single-core CPUs be

    What Oric meant was that higher frequencies require smaller distances or clock skew becomes an insurmountable issue. In a low-frequency circuit, propagation times (dependent on the speed of electrons in copper and the distance between circuit elements) are insignificant compared to the delay...
  16. I

    robust cryptography

    A few seconds per bit is crazy low.. And individually detectable across each 1kHz band.. That's just overkill! I suppose the 'message' is just some nonce signed with a cert whose common name is the copyright holder or something like that. Probably not a lot of information. Do you have any links?
  17. I

    robust cryptography

    That's interesting. Do you have an example of this? A recording of a TV playing a video should encode only the bare minimum to reconstruct the image as seen by the camera. It would seem that either the camera is not compressing well enough or the watermark "channel" has a very low bandwidth.
  18. I

    robust cryptography

    Format conversions, recompressions, and minor image modifications could all be modeled as different kinds of errors. For instance, a lossy conversion from TIFF to JPG, from high bit-depth to low, might be modeled as a binary erasure channel, where the least-significant bits are erased. Adding...
  19. I

    robust cryptography

    Don't get me wrong, steganography is definitely possible, it's just not practical. Who is maintaining this gigantic database of recordings? How are they paying for it? How are they implementing non-attribution? Furthermore, steganography is most useful when you're trying to hide the fact that...
  20. I

    3D Scanning / wide range time of flight measurement

    My comment was meant to imply that you don't actually have a solution with all those features. It's too far fetched. Plus, if you really had it in a footprint that small you'd be at production... Which means you'd already have a customer in mind. Finally, anybody with the funding and engineering...
  21. I

    (How) Do divining rods work?

    I'll play devil's advocate. Compasses were used for navigation hundreds of years before science came to any meaningful understanding of magnetics. In fact, compasses were primarily a fortune-telling tool before they were used for navigation! It could be argued that dowsing rods, while...
  22. I

    robust cryptography

    In encryption there is pretty much a direct correlation between damage done by errors and the strength of the block cipher mode. After all, a good cipher will produce entirely different cipher text for two plaintexts that are slightly different. Vice versa, a tiny change to the ciphertext will...
  23. I

    Optical computing

    Optics aren't used for computing at the interconnect level, but for data transfer. Optical transducers take space and (for now) the rest of the a computer system uses copper, so I don't see optical paths replacing copper traces for data transfer on a motherboard any time soon. As for...
  24. I

    3D Scanning / wide range time of flight measurement

    640x480 stereoscopic capture at 1000 frames per second across a 180 degree field of view, packaged into in less than a square inch and consuming less than 1 Watt? Any two of those parameters together would be impressive. All five is rather... impossible?
  25. I

    Which is more secure winrar or bitlocker?

    Any time you're looking at encryption solutions, you have to start by defining the threat-level against which you want to defend. For most of us mere mortals, the choice of cipher is more or less irrelevant unless you think somebody is really going to try and crack your encryption. Far more...
  26. I

    understanding probability theory... Infinite monkey theorem

    Actually, the only requirement is that the monkey's key-hitting-sequence adheres to a distribution for which every event has a non-zero probability. It doesn't have to be a uniform distribution. As long as we're assuming that a monkey can type for all eternity, we might as well assume he'll hit...
  27. I

    Is anything truly random?

    Some subatomic features, like the location of an electron, are random in the sense that we cannot specify the "answer" for a single event, but rather can specify a statistical distribution to which the event adheres. Those statistical distributions can, through various mechanisms, be combined in...
  28. I

    Double slit expt using sound?

    I'm not sure what this means. Why not just have a row of microphones and sample them all simultaneously, repeatedly, and plot the resulting volume recorded at each microphone? Your plot should look just like the interference pattern in the double-slit experiment. This is how I'd do it...
  29. I

    (How) Do divining rods work?

    Is it really? I've seen many card tricks that I can't explain, but I still don't think they're actually magic. The information that my eyes report to my brain is just one piece of evidence to consider when analyzing an extraordinary claim. Other things to consider include the physical laws of...
  30. I

    Are there people out there who 100% understand how a computer works?

    Here's an example of a protocol that you could never prove doesn't contain a hidden message, no matter if you knew the exact specification of the protocol and saw every byte transmitted between client and server. A client connects to a server and sends a single integer. The server replies by...
  31. I

    Double slit expt using sound?

    The double-slit experiment demonstrates the particle nature of light (by the absorption pattern on the front of the slotted wall) and the wave nature of light (by the pattern illuminated on the second wall by light passing through the slits). An experiment like that is needed because photons...
  32. I

    Is anything truly random?

    Like most discussions of randomness, this one went straight to philosophy! Randomness is a pet interest of mine and I registered just to write this long post. If you're not interested in what randomness really means in computer science / computational theory, this giant wall of text is going to...
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