I’ve shared a few of Vi Hart’s videos before, they are a gift to anyone who wants to make math fun because they are fun and about math. She made a documentary with ebstudioslive about how she makes he videos then she made a video about how he made that video, and all her other videos.
I could spend hours trying to find out what the japanese in this article is trying to say, or I can infer from the imagery that it is trying to teach you the optimal angles for staring up a girls skirt while walking up a set of stairs.
I wish I knew what book or magazine this came from, I’m sure it would be a gold mine…
While I object to the use of the word “nerd” I love the concept of this Nerd Baby Colouring in Book (Yes I spelt “colouring” correctly). If/when I have kids they will be getting a copy of this book by Tiffan Yard it seems to me that there is a whole industry based on selling stuff like this to relatively geeky parents as a couple of days ago I spotted another book entitled Introductory Calculus For Infants by Omi M. Inouye which is available at ThinkGeek:
I reckon there is a huge market for this and I’m going to start work on “The Very Hungry Paramecium” and the “Amoeba Who Was Wfraid Of The Dark” immediately…
I thought that looks feasible but does the equation really work? So I Googled it and up came a result at Math.StackExchange.com, which basically says yes…
To break it down the equations is made up of the following graphs stitched together (I’d write down the equations but I can’t get them to display correctly):
To Yield this:
Apparently the graphing tool the guy who answered the question was using fell over when it tried to draw the ears. It’s well worth looking at the answers to the question to see the figures in their full glory.
Interesting mathematical proof that that 100% of all numbers contain at least one 3 and despite there being an infinite number of numbers that don’t…
How can this be? The solution is so surprising, it is difficult, if not impossible to believe that 100% of integers contain the digit three at least once. The simple fact that the number 8, for example, has exactly zero threes in it seems to dispute this.
Consider this: what percentage of the first ten numbers contains at least one three? That’s easy- ten percent; three and only three. What percentage of the first one hundred number contains at least one three? A slightly inflated nineteen percent. What percentage of the thousand numbers contains at least one three? Twenty-seven point one (27.1) percent.
The percentage of numbers with threes in them rises can be expressed as 1 – (.9)^n, where n is the number of digits. It reaches 99% at about the point where n has 42 digits.
The ratio of “threed” to “three-less” numbers at infinity would be 1 – (.9)^(Infinity), or 1.
It is interesting to note that there are also an infinite number of integers which do not contain the digit three. The simple progression “1, 11, 111, … ” illustrates this fact.