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 predictable 🙂
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.