## Biweekly Links – 03-29-2010

March 29, 2010 by Saravanan Thirumuruganathan

** 1. ****Choosing the number of clusters II: Diminishing Returns and the ROC curve**

A nice intuition for ROC curve and how to use it to choose number of clusters.

**2. ****A beautiful model (of the stock market)**

Quite interesting post which argues at the macro level, stock market is quite well behaved and predictableðŸ™‚

**3. ****Square Dancing**

An intuitive proof to Pythagoras theorem.

**4. ****Law Enforcement Appliance Subverts SSL**

This attack is quite clever – a straight forward man in the middle attack which allows any one to observe all the transactions you make to any targeted website. It does require co-operation from both ISP and CAs but that should be easy for at least the feds. A more shocking vulnerability is this – **Vulnerabilities Allow Attacker to Impersonate Any Website** . Clever use of nulls to get a certificate for a fake domain from CAs.

**5. ****Interesting Math Problems**

A nice set of interest math problems . Got the link from Sriram.

6.** ****A single sperm has 37.5MB of DNA information in it. That means that a normal ejaculation represents a data transfer of 1,587.5TB**

Mostly tongue in cheek geek humor.

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