I came to know of Mark Chu-Carroll's "Good Math, Bad Math" blog via a post in “Programming Musings”, the blog of José Antonio Ortega Ruiz. Mark writes mostly about mathematics, the theoretical foundations of programming, debunking bad use of mathematics in popular and not-so-popular media, etc.

I find many of Mark's articles very interesting to read, though many others go
way over the top of my head. Some of his recent articles that I found really
interesting include one
that shows how absurd arithmetic with Roman numerals can be, one on
Poincaré Conjecture, some in the “Friday
Pathological Programming Language” series, one on zero, one on
*i*, one
on *e*, one on
Φ, one
on Ω, one on
Π, one
on continued fractions, etc. The old
home for the GM/BM blog contains *many more* interesting and
insightful articles on math and programming theory. What an amazing guy!

Highly recommended.