Even though I have no Hebrew, I found this blog, Balashon, Hebrew Language Detective, engrossing.
I’ll let the author introduce the blog himself:
“I’m a native English speaker, but live in Israel and love the Hebrew language. On this site I investigate Hebrew - Biblical, Talmudic, Medieval and Modern - including slang; related languages like Aramaic, Arabic, Akkadian and Yiddish; and how foreign languages like Greek, Latin and English have entered Hebrew - and how Hebrew has affected those languages as well. I discuss the meanings of words, with a focus on etymology. I’m not a professional linguist, and will be using this blog to explore my own questions, and I welcome yours as well.”
For an aperitif, try this fascinating entry on Hebrew numbers.