Good morning, John.

Thanks for making it animal sex week on a week when I have to write a song. Tragedy of tragedies, I had to write a song about animal sex! Here it goes. [singing] We've been together for a while girl, quite a while, And I think by now I know how to make you smile You love evolutionary biology And elegant adaptations are so sexy But I want to teach you the realities of birds and bees We all know about giraffes girl, they make me laugh Their men have more sex with each other than with their better half And there is no better way to destroy A mood than to make a tortoise noise But I won't do that stuff Just lovin' is enough.

Oh, baby there's a lot of ways to make a baby And if things go right for us I was hopin' maybe We could try a couple out, see what the fuss is all about It's just the birds and the bees and the chimpanzees And if things go right maybe you and me Dolphins certainly are cute, girl, but I must boast Dolphin sex lasts just twenty seconds at the most But what I got is pretty dull Next to the amazing barnacle Their junk is fifty times bigger than their body size And the male anglerfish gets completely screwed Proving sometimes sex sucks even for the dude But the violent prize goes to the flatworm Using a sword-like penis to stab in his sperm It's an uncomfortable world... But not for my girl Oh, baby there's a lot of ways to make a baby And if things go right for us I was hopin' maybe We could try a couple out, see what the fuss is all about It's just the birds and the bees and the chimpanzees And if things go right maybe you and me Yeah, if things go right maybe you and me Oh, if things go right maybe you and me [speaking] Yeah? *wink* What do you think? I put the bit about chimpanzees in because I wanted to put some footage of chimpanzees having sex, but turns out it's a little too much like people having sex for me to be comfortable with that.

Was it creepy? I don't...it was a little creepy. Let me know in the comments if you thought it was creepy.

Speaking of asking and answering questions, I just started a new profile at a new site called vyou.com - it's v-y-o-u dot com. And I'm at vyou.com/hankgreen and it's kind of cool and I want to know what y'all think of it. Now it's come to the time of the year where we must face the uncomfortable truth about space pasta.

Several people made excellent calculations, and no matter how people do calculations - several different ways - the unanimous response is that moon pasta is much less efficient than earth beef. My two favorite videos were Mike Lombardo's and the Dancing Hawk's. Mike Lombardo only calculated the getting of the rocket to the moon and bringing it back from the moon with the pasta on board.

And that turned out to be something like four hundred times more energy intensive than growing a cow, which honestly seems a little low to me. The Dancing Hawk, on the other hand, figured out how much it would take to get all of the supplies to the moon necessary for building a farm there and then getting the pasta back, which if it were done turns out would be the most inefficient endeavor in all of human history. According to the Dancing Hawk's calculations, which seem pretty sound to me, it's about 6,500 times less efficient to grow moon pasta than earth beef.

And now we know. And knowing is half the battle. John, I will see you on Friday.

And this is the new screen that we're thinking of having at the end of all of our videos. The stuff on the left hand side, you'll see the shirts and the Truth or Fail, that stuff will change. The previous/next video thing will always be there after the Subscribe and the Twitter and the Facebook things.

And I wanted to know what everyone thought of that idea. Okay, that is all. Goodbye for real this time.