What is Digg?57 Comments
- EochaidRiata, on 10/12/2007, -10/+67Why?
Spend that time dong something that will actually impress women, such as memorizing the Rubik's Cube solution, or Monty Python sketches. - toxicredm, on 10/12/2007, -0/+31@rodrigo74:
That whooshing sound you hear? That's the sound of sarcasm flying over your head. - twinklyJesus, on 10/12/2007, -2/+16Another sad dating error.
You'd have better luck impressing a girl with the fact you speak fluent Klingon. - inactive, on 10/12/2007, -0/+13Awesome. Something else to add to my list of "panty droppers". Right up there with configuring Ubuntu, and "compiling her kernel".
- GrayV, on 10/12/2007, -0/+13I actually spent 2 days on this and can successfully perform the technique within 30 seconds. I went to a bar, spotted a great looking girl and explained that if she gave me 9 digits I could root her within 30 seconds.
Turns out this is not an attractive skill to women. - derkaas, on 10/12/2007, -0/+13Existence has been difficult up to this point. But at last, sweet relief.
- fcmk, on 10/12/2007, -1/+14I see that you, rodrigo74, have no sense of sarcasm what so ever.
- imightbewrong, on 10/12/2007, -1/+12finally!
- Recluse, on 10/12/2007, -3/+11Good to know I'm not the only one.
When it came to math I was something of a "complete ***** retard." - Obsidian743, on 10/12/2007, -0/+9Dammit. Wish I had this yesterday when I was taking my "Cubes of Nine Digit Numbers" exam.
- jellyroll713, on 10/12/2007, -4/+11Then you've done nothing but draw attention to your own stupidity.
- enivid, on 10/12/2007, -2/+9I think I'll stick to my TI86 thank you.
- Salviati, on 10/12/2007, -0/+7The site includes a practice page for honing your new skill!
- domusvita, on 10/12/2007, -0/+5"Hey..if I told you I could do cube roots up to nine digits...heh...would you hold it against me? Wait."
- dustko, on 10/12/2007, -3/+9"If you liked this page, you might also like my PrimeShooter Space-Invaders-style Javascript game, where you have to kill the attacking numbers by firing prime factors at them until they are reduced to 1."
............ I think that "sums" it up. - chownrus, on 10/12/2007, -0/+4Another winner is the ability to estimate square roots. For example:
The square root of 69 is ...
Eight-something
(funnier out loud) - pixelmixer, on 10/12/2007, -0/+3damn, same here. It was pretty easy tho. We were allowed to use calculators.
- inactive, on 10/12/2007, -0/+3Psh... how lame. The true art of panty dropping relies on attire on the cutting edge of fashion. Pen holders and an graphics calculator clipped to the mohair belt your grandmother gave you for Christmas are key.
- LongLostStar, on 10/12/2007, -0/+3Does anyone have a link to some kind of collection of cool mind tricks like this one?
- DooDooFace, on 10/12/2007, -0/+3As Barbie once said, "Math is hard"
- Leadhyena, on 10/12/2007, -0/+2Thanks for the blog link. This guy is a little off the deep end but he has some interesting theories. Back to the math: the trick is only a setup to allow an interesting discussion of math, on how to calculate a cube root only knowing that it is a cube. The trick really does some cool stuff with modulo arithmetic, and talks about the limitations of some bases (like the non-cyclic nature of Z/ for instance when calculating the middle digit). Those of y'all who are knocking its setup are missing the cool math behind it. Of course you wouldn't do this at a party, but the math is still interesting in its own right.
- inactive, on 10/12/2007, -5/+8EochaidRiata: Funniest comment ever, especially because I actually know people like that (particularly the Monty Python bit).
- Twango, on 10/12/2007, -0/+2I knew we were in trouble when the title didn't end with "easily".
- wurzelgummage, on 10/12/2007, -10/+11Just a 2 second glance at that page made my brain start leaking out of my nose.
- pixelmixer, on 10/12/2007, -1/+3I dont think the actual article says anything about using this to impress women. Why would you" digg it with no intention to digg it" based on its effectiveness at impressing women? Digg it down because you dont like math or something, a better excuse than digging it down because it lacks the ability to impress women.
- rodrigo74, on 10/12/2007, -0/+2ok ok you got me..my sarcasm-o-meter was probably low on battery yesterday when I wrote this :)
- hongy_r, on 10/12/2007, -0/+29 digits is a bit much for me, but 6 digits is still useful and could possibly impress some girl somewhere.
- eean, on 10/12/2007, -1/+3Nah. Captain Picard impressions FTW.
- ei8htball, on 10/12/2007, -0/+1-2 mod 11 = 9 ;-)
- somon90, on 10/12/2007, -1/+2why make it this complex, i just think about hypercubes moving in synergetic paths through five-dimensional spacetime, then it only takes around 4,39 nanoseconds to calculate the cube root of real numbers with up to 10^59 decimals , it´s easy
- rmacnguyen, on 10/12/2007, -0/+1Try http://www.math-magic.com/
The site has tricks used on middle and high school TMSCA (an association of statewide math competitions in Texas) and UIL Number Sense tests, which are mental math tests. The tests have 80 problems for which the contestant is given 10 minutes to complete. All math must be done mentally, and there can be no marks on the paper except for the answer. Man...this brings back memories... - Salviati, on 10/12/2007, -0/+1Once you memorize the two tables, It is only addition and sutraction. He does give a bit more background than you need, but I find that interesting myself.
- rmacnguyen, on 10/12/2007, -0/+1Haha, anyone else used to do TMSCA Number Sense?
- CammyBoy, on 10/12/2007, -1/+2This is a duplicate: http://www.digg.com/general_sciences/How_to_Do_Cube_Roots_of_9_Digit_Numbers_in_Your_Head but that was a year ago. Thanks for reminding me about this!
- Salviati, on 10/12/2007, -0/+1If the number you get for the middle x is < 0 or >10, you will need to add or subtract 11 to make it between 0-9 (as far as I know, you can't end up with exactly 10).
For example: -2 --> 9, -8 --> 3, 15 -->4, 11 --> 0, 25 --> 14 --> 3, etc. - Salviati, on 10/12/2007, -0/+1Actually, it can be any number between 1-1000, then cubed.
- FLAGEL, on 10/12/2007, -0/+1With the risk of sounding stupid, I don't get it 100%.
Lets say we use the number 293, 293^3 = 25 153 757.
Now the easy part, the cube root of 25 153 757 has to be 2x3. Now, to calculate x we'll use mod 11, 7 - 5 + 7 - 3 + 5 - 1 + 5 - 2 = 13 = 3 - 1 = 2 mod 11. So 25 153 757 = 2 mod 11. Meaning cube root = 7 mod 11.
3 - x + 2 = 7 mod 11 i.e. 5 - x = 7 mod 11, so x = -2, makes no sense O_o? I'm tired. - fun4stuff, on 10/12/2007, -0/+0it took me about 10 mins to learn this and i am down to 10 seconds to calculate 2 digit cube roots and about 30 seconds for 3 digit cube roots
- inactive, on 10/12/2007, -1/+1yea nothing wrong with my Ti86 !
- UltraNurd, on 10/12/2007, -1/+1@twinklyJesus
You could always try reciting lines from Hamlet - in the original tlhingan Hol. - qasabah, on 10/12/2007, -1/+0...
- inactive, on 10/12/2007, -2/+1http://www.duggmirror.com
- troon, on 10/12/2007, -1/+0Mm. Notwithstanding the lack of pulling ability this would generate, there's a bit of a problem. To get a 9-digit number that's a cube of an integer, you have to ask your audience to pick a number between 465 and 999, cube it, and tell you the result. That restriction would seem a little contrived.
- inactive, on 10/12/2007, -7/+6Fast estimation. In the time it takes you to find your calculator and punch in the numbers, someone else could be at an answer, or a close approximate thereof.
- qasabah, on 10/12/2007, -1/+0I suspect that 95% of diggers didn't get the full meaning on that one.
I personally got a good chuckle from the Canadian olympic apparel proudly emblazoned with the words "Roots".
http://www.darwinsmoustache.com - biologynerd, on 10/12/2007, -1/+0Sweet! Thanks for the tip. Now I got a new pick up line for parties!
- Ramble, on 10/12/2007, -3/+2I just keep my calculator near me at all times.
Much quicker. - rkenward, on 10/12/2007, -3/+1Dugg but with no intention to do this. I can't think of a single woman who would be impressed by this, especially since you could easily make up a wrong answer sound confident and not actually do this. Chances are they also did not read this.
- sygirl101, on 10/12/2007, -2/+0I think I would be suitably impressed if a guy demonstrated his ability to cube root numbers, but I would be even more impressed if he could do it to numbers that weren't perfect cubes (to .001 decimal places). Maybe I'm just picky and strange.
- SplntrCelSpdrMn, on 10/12/2007, -2/+0hey underthelinux, 3th is not an abbrev. 3rd IS
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