Apparently, “science” is a term trademarked by Kimberly Clark:
* Trademark of Kimberly Clark
I don’t really think that’s fair.
But not everybody is satisfied with the tape.
I guess you can’t please everybody.
I was watching bad TV the other day, and I got bored and started playing with a cool LED pen Thorlabs gave me. I was also drinking some VS (the cheap stuff) Courvoisier cognac. I was surprised to see fluorescence coming from the cognac when illuminated with the blue LED (the fluorescence is the greenish glow):
I suppose that it shouldn’t be surprising, given that cognac is so aromatic! But a visible absorption and green fluorescence isn’t from benzene or something—it’s from a real fluorophore. Cool.
So I wonder what fluorophore is in cognac. I know that coumarin (general structure above) is found in some plants, such as cinnamon, and some coumarins absorb in the blue. And there are a lot of tannins in wooden barrels.
I found these fluorescence spectra of brandy (B), whisky (W), slivovice (S), and juniper spirit (J). Note that the brandy—cognac is a brandy—does fluoresce in the blue/green.
No one wants to write an easy book with Mitch? I’m writing a page. Just choose a name reaction and draw it, yo!
And a video (more below):
My cousin and I bought a crappy old speaker to $3, tore off the cover, and spread a thin polyethylene bag (like the bags you put vegetables in at the grocery store). We used a free waveform generating software to apply sinusoidal waves at a range of frequencies—anywhere from 10-200 Hz had an effect. The oobleck was just a mixture of corn starch and water.
I was totally surprized that we actually saw those strange finger things! They weren’t as cool as in the PRL paper, but ours was a fairly ghetto setup. I couldn’t get those persistent holes to form, but whatev.
Here are the rest of the videos.
Recently, I published two posts concerning an e-mail I received from a rather confused individual regarding his theories on evolution. Shortly after the threads went up on this blog, I received a very frank message from a reader who knows the author. Out of respect, I’ve taken down my previous posts.
And now, for a geeky unicorn chaser:
Look Around You: Germs (YouTube)
I am a physical chemist.
My office is directly across from the NMR room. Students (undergrads? first-years? I dunno) keep knocking on my door and asking me if I have a key—of if someone is coming to train them—or if this is the NMR room. WTF?
I’ve never used the NMRs alone and I’m not trained on them and I don’t have a key.
Leave me alone.