Data Jewelry

Here is a novel data representation, high and low temperatures over the course of a year are laser-cut into small house-shaped slices that encircle the bracelet. Also shown are small circular holes with area proportional to the monthly rainfall. A flattering year's worth of weather data to wear on your wrist. See details here.

Time Series Heat Map in R

The Revolutions blog gives information on the statistical programming language R. Heat maps are shown in a recent post. A calendar is displayed horizontally with days of the week in rows and months arranged in jagged columns (since not all months have the same number of days). A color is plotted on each month's day for the magnitude of a time series variable (in this case the stock price for Microsoft) over several years of calendars. The site gives R code developed by Paul Bleicher, MD PhD, Chief Medical Officer at Humedica for producing these plots.

A Normal Sidewalk?

I've seen this pattern in many sidewalks. A crack forms at the seam of two pieces of concrete. Over time and use the crack crumbles away portions of the sidewalk in a bell-shaped pattern. What process or differential equation might define the resulting bell-shaped pattern of wear?

The Density of Space Trash

Here is an image showing the density of space debris in low earth orbit. Notice that this density has a very long, and likely heavy, tail that is not shown. Geo-synchronous satellites orbit at 36,000km well off the upper range of this graph (2,000km). There would be a large bump in the density at 36,000km. From The Washington Post.

A Pearl: a Balanced Median Necklace

The September issue of The College Mathematics Journal has this balance point view of the median by Mark Lynch of Millsaps College.

Wine consumption for various countries proportional to the area of each circle. Strangemaps.wordpress.com has an interesting discussion of trying to make sense of the numbers in this map that has no legend to tell you what the numbers mean. Why is Luxembourg so big?

A Sad Tally Indeed

Discrete distribution of Golden Gate Bridge Suicides. Locations plotted to the nearest light pole. The bay side is more popular than the ocean side. Any conjectures as to why? From strangemaps.wordpress.com via sfgate.com