I'm pretty sure it's just a typo. The actual title is "The most counterintuitive facts in all of mathematics, computer science, and physics", which is slightly

I'm pretty sure it's just a typo. The actual title is "The most counterintuitive facts in all of mathematics, computer science, and physics", which is slightly too long for HN and a bit click-baity. No need to retype or abbreviate CS though.