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What did you learn today?

  1. Jun 8, 2008 #1
    Every day I would come home from school and my sister would ask me, "what did you learn today?" Sometimes I'd stammer and tell her I hadn't learned anything useful, while other days I'd happily tell her I read Phaedo or learned what an isotope is. In the 'Does your interest in learning cease at a certain age?' thread jimmysynder reminded me of this old tradition we had.

    So today, tomorrow, and any day you get the chance, post something you learned. Anything from a new physics equation to a new word - whatever it is regardless of how technical or simple. I'll start.

    Today I learned how to measure how big the Earth is using only the sunset when I'm laying down and when I'm standing.
  2. jcsd
  3. Jun 13, 2008 #2
    jun 5- world environmental day
  4. Jun 13, 2008 #3
    the time taken for the light to reach earth from sun is
    just ONE second
  5. Jun 13, 2008 #4


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  6. Jun 13, 2008 #5


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    I learned that my birthday falls during National Procrastination Week. I wish I would have learned that sooner.

    That's true if you're also moving from the Sun to the Earth at 99.9% of the speed of light.

    Well, at least according to your clock. Astronuc's clock might disagree if he's just lollygagging on Earth.
    Last edited: Jun 13, 2008
  7. Jun 13, 2008 #6
    I learned that the first day of summer this year is on the 21st.
  8. Jun 13, 2008 #7
    Following BobG's birthday discovery I self looked into if anything interesting happened on my birthday, and indeed it did! I have the same birthday as J.R.R. Tolkien!
  9. Jun 13, 2008 #8


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    How did get around to setting the date for that?
  10. Jun 13, 2008 #9
    They sent out a survey asking respondents to pick a week. The procrastinators never got back to them, so they got what was left over.
  11. Jun 13, 2008 #10


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    Wow! You've got a lot better birthday than me. On my birthday, Thomas Edison didn't invent the movie camera; Osama Bin Laden was born; some jerk of a boss said, "Come here, I want to see you" on the phone for the first time; the NASDAQ peaked at 5132.52 and the dot.com boom started its crash; and some scientist told me, "There's rings around Uranus."

    It almost makes me embarrassed to wear a T-shirt with my birthdate (Julian date {except for leap years}) on it.
    Last edited: Jun 13, 2008
  12. Jun 15, 2008 #11
    world pie(22/7) day is march 14
  13. Jun 15, 2008 #12
    Today I learned about general and special relativity, it was really exciting, I think most of the physicists when they get old, they remember times like these ~ learning new stuff.
  14. Jun 15, 2008 #13
    I learn at least 10 new facts every day. But it would be too much time for me to type it all.
  15. Jun 15, 2008 #14
  16. Jun 15, 2008 #15
    Today, I learned that the there are significant sequence homology and functional similarities between the type-II secretory system, the type IV-pilus and the archaebacterial flagellum.
  17. Jun 15, 2008 #16


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    I disagree. I may be a young guy myself(rising college senior), but it seems to be the greatest part about being a scientist is that there is always new stuff to learn, no matter what stage of your education your at.
  18. Jun 15, 2008 #17
    Maybe im alone on this one, but I dont get 'excited' to learn anything. I just like learning things, but I dont go 'yes, now im learning (x,y,z)!'. I just go, 'ah, thats interesting....NEXT'.

    The only time I get 'excited' is when Im able to see something working in the real world and go, 'ah, this is a _fill_in_the_blank". I know all about this. Why this was designed this way, and not that way. etc, etc. Or who designed it, and what it means.
    Last edited: Jun 15, 2008
  19. Jun 16, 2008 #18
    Now that's just showing off :rofl:
  20. Jun 17, 2008 #19
    The expected absolute value of the sum of the signed displacements of m random walkers after n steps is the same as the expected absolute value of the displacement of 1 random walker after n x m steps.
  21. Jun 17, 2008 #20


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    I learned that a truck bumper that has rotted braces on one side can have LOTS of healthy metal in the braces on the other side, requiring a lot of sawing to sever. Luckily, I have 18V Makita power tools and had a still-usable metal blade.
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