Here's where you learn the difference between software threads (old hat) and hardware threads (pretty new hat)
26:10 -- If you have a Mac, you can try this yourself; open a terminal and paste or type in this command:
/usr/sbin/sysctl -a | grep "hw\."
His slide doesn't have the quotes, but without them you'll get a bunch of other stuff that you don't want. As it is, the shell will eat the quotes, and grep will see hw\., which means "letter h followed by letter w followed by a dot"; without the quotes, the shell will eat the backslash, and grep will see hw., which means "letter h followed by letter w followed by any character", so "hwcksum" will match the pattern, and you'll get a bunch of those. /usr/sbin/sysctl -a | grep hw\\. also works
You can do this because OS X is FreeBSD under the hood. FreeBSD is a variant of Unix that is similar to Linux. There's probably something similar in Windows, but I cain't hep ya with that.