Sonic Hedgehog protein

Even though this sounds ridiculous, the gene that helps determine physical structures in people, including teeth and appendages, has been named Sonic Hedgehog (SHH). Yes, after the video game character. It is one of three hedgehog homologues in mammals.

An acre is a measurement of area equal to 4,840 square yards or 43,560 square feet. That is 4046.8 square meters. It was supposedly originally defined as the amount a man could plow with an ox in one day.

"Land der Berge, Land am Strome" (Land of Mountains, Land on the River") is the national anthem of Austria. The music is adapted from a work by Mozart, itself adapted from an earlier work by Johann Holzer. The lyrics were written in 1946 by Paula von Preradović.

A lepton is a fermion (a sub-atomic particle with 1/2 integer spin) that is opposed to a quark. An electron is a kind of lepton.

The Helga pictures are a series of nearly 250 studies by Andrew Wyeth of his neighbor Helga Testorf, mainly painted between 1971-85 (though the final Helga picture was made in 2002).

The clarinet is the only single reed woodwind usually found in orchestras. (The saxophone is the other single reed woodwind.)

Raccoon Lodge

The Raccoon Lodge was the fraternity Ralph and Ed belonged to on 'The Honeymooners" (Bensonhurst, Brooklyn, chapter).