Data Density

February 9, 2010

A regular compact disc or CD is 12cm. Knowing this we can figure out the following densities:

  • CD-ROM: 700MB = 58.33MB per cm
  • DVD: 4.7GB = 392MB per cm
  • DVD-DL: 8.5GB = 725MB per cm
  • Blu-ray: 25GB = 2.083GB per cm
  • Blu-ray DL: 50GB = 4.167 per cm

If we take the following densities however and apply it to Laserdisc size discs of 30cm we get the following storage capacities:

  • CD-ROM: 1749.9GB
  • DVD: 11.76GB
  • DVD-DL: 21.75GB
  • Blu-ray: 62.49GB
  • Blu-ray DL: 125.01GB

The population of The USA

February 6, 2010

The population of the United States is forecasted to grow 9.9% from the 2000 Census of 281,421,906 to 309,162,581(Wikipedia article on the population of the USA.)

The size of the USA’s land area according to the CIA World Factbook is 9,161,966 sq km.

So if everyone in the USA were to mark off a 1.5 m square on the ground they would take up 463.75 sq km. That means only 0.000051% of the area would be used leaving the other 99.999949% or 9,161,502.25 sq km uninhabited.

Now we open GIMP and do some fancy foot work.

This graphic (click it) represents what the population takes up and what would be uninhabited. Do you see that little red dot in the top left corner? That’s us.

My dog Chico and how the years go by.

February 5, 2010

Chico at window

Chico at window

My dog Chico is turning 10 in April so that means using the established 1 human year = 7 dog years that means he’ll be 70 years old. This isn’t totally about Chico I just wanted to introduce the world to my sweet doggy Chico. If you actually knew Chico however you’d know that I’m sarcastic. In actuality he doesn’t like anybody.

The next thing I want to talk about is 1 human year = 7 dog years. Again using my favorite online calculator Wolfram|Alpha we figure out the following:

1 dog year = 1 month 21 days 17 hours 25 minutes 42.86 seconds

1 dog month = 4 days 8 hours 17 minutes 10 seconds

1 dog week = 1 day 5 minutes 2.079 seconds

1 dog day = 3 hours 26 minutes 25.71 seconds

1 dog hour = 8 minutes 36 seconds

A Person’s Software Version

February 4, 2010

You know how software always have a number assigned to it. For instance the current version of Firefox is 3.5.7. So I was sitting here thinking why couldn’t a person have a software version as well. First if you read this Wikipedia article on software versioning you’ll get what I’m getting at sooner. Basically software goes from alpha, beta, release candidate, public release. If you consider the gestation to be the alpha stage (which resets back to 0 when you’re born), 0-10 years old beta, 11-19 years old public releases, and 20+ public releases.

To figure this you need to go to Wolfram|Alpha:

  1. Enter your birthday. Mine is February 18, 1986.
  2. Today being February 4, 2010 that means I’m 23 years, 11 months, 14 days old.
  3. The version number is
  4. So mine would be

You don’t have to use the month or day as the number. Also. You could if you wanted use the decimal of the month so 11/12 = .92 to make my version number 2.3.92.

For example I’ve figured up some famous peoples birthday:

  1. Richard Stallman – Born March 16, 1953 – Ver. 5.6.10
  2. Corey Doctorow – Born July 17, 1971 – Ver. 3.8.6
  3. Randall Munroe – BornĀ  October 17, 1984 – Ver. 2.5.3