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  1. lpetrich

    Voyager 1 Communicating Intelligibly Again

    Half a year ago, the Voyager 1 spacecraft suffered a computer-system malfunction. Engineers Working to Resolve Issue With Voyager 1 Computer – The Sun Spot On 2023 November 14, the spacecraft's flight data system (FDS) started sending back nonsense: repetitive patterns of 0's and 1's...
  2. lpetrich

    Boston Dynamics retires its famous humanoid robot Atlas

    Boston Dynamics Retires Its Legendary Humanoid Robot - IEEE Spectrum noting Farewell to HD Atlas - YouTube Atlas Manipulates | Boston Dynamics - YouTube Evolution of Boston Dynamic’s Robots [1992-2023] - YouTube All New Atlas | Boston Dynamics - YouTube - electric instead of hydraulic and...
  3. lpetrich

    Starfish and Tardigrades are All Head

    Adult starfish (sea stars), at least. Along with adults of some other echinoderms: sea urchins (echinoids) and sea lilies (crinoids). Starfish Are Heads--Just Heads | Scientific American noting an article in Nature magazine: the animals are actually almost all head and no trunk This seems like...
  4. lpetrich

    Jesus Christ, Made In Our Likeness

    Not just physical likeness, but also social and political and ideological likeness. Samuel Perry on X: "🧵 Ever notice folks ..." / X Then, Samuel Perry on X: "Incidentally, ...." / X I prefer to recognize that Xenophanes was right about this issue. Some 2,500 years ago, he noted that people...
  5. lpetrich

    Ending Daylight Savings Time? Making It Permanent?

    Here in the US, the clocks were shifted forward 1 hour, going from Standard Time to Daylight Savings Time. Daylight saving time "Port Arthur, Ontario, Canada, was the first city in the world to enact DST, on 1 July 1908" - it was then widely adopted around World War I. More recently, however...
  6. lpetrich

    Walking on other planets: legged rovers

    To date, every vehicle that has moved around on the surface of another celestial body has moved on wheels. But wheeled vehicles have trouble traveling through rocky terrain, terrain with the rocks comparable in size to the wheels. That has provoked interest in legged rovers that walk over rocks...
  7. lpetrich

    Planets Uranus and Neptune almost the Same Color: Light Greenish-Blue

    Neptune and Uranus seen in true colours for first time - BBC Uranus and Neptune Reveal Their True Colors - The New York Times noting Modelling the seasonal cycle of Uranus’s colour and magnitude, and comparison with Neptune | Monthly Notices of the Royal Astronomical Society | Oxford Academic by...
  8. lpetrich

    Donald Trump rated last by researchers

    I am late for this, since Presidents' Day was on Monday. It is intended as a combination of George Washington's and Abraham Lincoln's birthdays. George Washington's is on February 11, 1732 in the Julian calendar, February 22, 1732 in the Gregorian calendar, which we now use. Abraham Lincoln's...
  9. lpetrich

    More Medical-Debt Forgiveness

    A little over a year ago: Toledo OH city council moves to forgive medical debt | Internet Infidels Discussion Board Followup: Toledo, Ohio, Relieving $240 Million in Medical Debt With Biden Funds - Sep 19, 2023, 6:32 AM PDT and I-TEAM: Medical debt forgiveness arrives for area patients - Nov...
  10. lpetrich

    Caffeine

    Caffeine is a favorite stimulant regularly used by large numbers of people. It is a "purine", chemically similar to nucleobases adenine and guanine, and it works by blocking adenosine (adenine + ribose) from a certain receptor because of its chemical resemblance. That blocking increases the...
  11. lpetrich

    The Golden Bough

    The Golden Bough How good is that work? There are at least two parts of it that one can assess. The first is his collection of folklore and mythology and magical and religious practice. The second is his thesis that many societies go through a phase of regularly selecting and then killing...
  12. lpetrich

    More BRICS - more countries join that political and economic bloc

    BRICS "The term BRIC was originally developed in the context of foreign investment strategies. It was introduced in the 2001 publication, Building Better Global Economic BRICs by then-chairman of Goldman Sachs Asset Management, Jim O'Neill." But BRIC itself started out with the foreign...
  13. lpetrich

    Minnesota has a new flag

    The US state of Minnesota now has a new flag.
  14. lpetrich

    Trigonometric functions from their differential equations

    Michael Penn runs a nice YouTube channel: (3) Michael Penn - YouTube I recall him making a video about deriving trigonometric functions' properties from their differential equations, and I will redo that reasoning here. First, a simpler version of that reasoning, with the exponential function...
  15. lpetrich

    Color-Blindness Glasses Scam

    Exposing the Color Blind Glasses Scam - YouTube The glasses themselves have a strong magenta fiilter, so all they do is make the world look more strongly colored. So that's how they seems to work. Also, for a colored-balloon test, the balloons are marked with names of colors. I was very...
  16. lpetrich

    Essential nutrients - what do we need to eat?

    For human nutrition, there are six types of essential nutrients. Some are needed in much greater quantity than some others: macronutrients vs. micronutrients. Water - H2O - every organism needs it to metabolize, and thus to grow and reproduce Carbohydrates - sugars and sugar-like stuff...
  17. lpetrich

    The Cosmic Hunt

    We human beings have been telling stories about ourselves and about the world around us for as long as we have any record of doing so, and likely for all of our existence as a species. Some such stories have rather obvious environmental origins, like the monster theory of eclipses. But others...
  18. lpetrich

    Spacecraft to iron asteroid Psyche

    The Psyche spacecraft is on its way to its namesake asteroid 16 Psyche That asteroid has lots of iron on its surface, much like some iron meteorite, and it will be the first such asteroid ever to be visited by a spacecraft. It is about 220 km (140 mi) in diameter, though with a rather irregular...
  19. lpetrich

    Nobel Prizes 2023

    Press release: The Nobel Prize in Physiology or Medicine 2023 - NobelPrize.org Awarded to Vaccination has come a long way over the centuries. It started out as inoculation, based on the observation that someone who recovers from smallpox never suffers from that disease again. Inoculation was...
  20. lpetrich

    Recent Moon landings

    Recently, two nations have landed spacecraft on the Moon, one successfully, and one a failure. List of missions to the Moon Russia's first lunar mission in 47 years smashes into the moon in failure | Reuters Luna 25 ("Moon 25") It was launched on 10 August 2023 and it entered lunar orbit on 16...
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