Tag archives for xkcd

  1. In Greek legend, Icarus flew too close to the Sun, and the heat melted his wings and he fell to his death. But “melting” is a phase change which is a function of temperature, a measure of internal energy, which is the integral of incident power flux over time. His wings didn’t melt because he…

    Randall Munroe

  2. Napkin Analysis of the Sand Flea Jumping Robot

    I shared this video1 with Peter, who then asked: I saw that a couple days ago. Awesome! And has some cool practical applications. I [couldn’t] quite tell if the pitch of the robot was adjustable by the user, or of it always jumped in the same direction. Did you get a sense for that? It…

  3. The Day The Music Died

    Yahoo! is shutting down GeoCities today. A little known fact is that I used to have a web presence on GeoCities. In fact, it’s still there! I’ve checked back a couple times a year to see if it was still up and running it, and it always was.

    St…

  4. Finally, An Answer

    Several years ago, I posted a problem describing a plane on a massive conveyor belt:
    Imagine a plane is sitting on a massive conveyor belt, as wide and as long as a runway. The conveyer [sic] belt is designed to exactly match the speed of the whe…

  5. Quotes of 2007

    It’s that time again. I’m clearing out my quotes section on Facebook to make way for the new ones I’m sure to amass in 2008.

    "Now cracks a noble heart. Good night, sweet prince,
    And flights of angels sing thee to thy rest!" – William Shakespea…

  6. Other Properties of Prussian Blue

    As told by Wikipedia:

    It is electrochromic-changing from blue to colorless upon reduction. This change is caused by reduction of the Fe(III) to Fe(II) eliminating the intervalence charge transfer that causes PB’s blue color.
    It undergoes sp…