Floating-point math

Most programmers don't get it right. They forget that floating-point numbers aren't precise, and that different numbers are irrational in base 2 than in base 10. End result: math errors and weird results.

So, on the web: a basic guide to floating point math.

And for the true math geeks: David Goldberg's paper on floating-point math, and the original ACM journal article if you have an ACM account with library access.

Signs your workplace may not be as professional as they claim to be

First sign: having to explain in small words what "significant digits" are, and why where the decimal point is doesn't matter when dealing with them. The targets of this explanation all have degrees in either computer science or an engineering discipline.

Meanwhile, over in alt.sysadmin.recovery, people with no degrees at all are having intelligent arguments over the differences between the various alephs and whether particular ones are ordinal or cardinal numbers.