Gravity does pick out some elements more than others. The Boltzmann distribution of helium atoms tails out at a much lower velocity than the distribution of hydrogen atoms. Near the top of the atmosphere, you will see many more hydrogen atoms than helium atoms shooting outward at escape velocity. This is why on Earth, we only have a tiny bit of helium to fill our balloons that came from radioactive decay of heavy elements, and most of it will someday make it into space.

The one that was engineered into imidacloprid on purpose: it blocks nicotinoid pathways that primarily exist only in the central nervous systems of insects.

No. Most modern insecticides were designed not to target mechanisms that are present in the nervous systems of mammals.

My car fires neutrinos out the back of the engine to pick up momentum and go down the street. The neighbors were making fun of it recently saying my car only uses weak interactions. I said quit pissing me off or you might get a faster-than-light whack in the head while asleep in your house at night.

I used to beat those crashes by taking a bunch of ice cubes, double-bagging them in ziplocs, and placing that on top of the ZX81 where their crappy thin aluminum prong "heat sink" came up from the board to meet the upper case interior. I never had "unreasonable" crashes after that but I went through a lot of ice cubes with that little thing.

I spent two hours in a 3-Tesla MRI scanner this morning getting my occipital lobes scanned while I had to fixate on a dot that would change color back and forth from red to blue, requiring trigger button presses. Besides the expected marching checkerboard rows, they showed behind the dot, every couple seconds: face... face... upside-down face... house... upside-down house... face... house... upside-down face... face... house... face... upside-down house... upside-down house... face... etc. Then, they would show the dot behind words every couple seconds: tennis... cubic... weapon... village... curved... submit... option... mobile... curved... tennis... letter... village... etc. Then, behind four-digit numbers: 8663... 1845... 2853... 9231... 1845... 4408... 7392... 8663... 1424... etc. And finally, behind names of numbers: thirty... eleven... seventy... twelve... eight... fifty-three... seventy-two... ten... That was obviously to pick out some artifact.
These images were being displayed from a PowerMac using some software from a company called PsychoGenix or something (I forget). One funny moment was when it underestimated the Mac screen resolution, and displayed the central fixation dot in the upper left. They apologized for that being in the wrong place and it took them a while to move it back to the center. I didn't think to look more closely at how the actual large flat screen display above the magnet worked, when I had my chances. But the image was focused down an optical path down mirrors to me lying face up in the coil. During the control scans they said "close your eyes and let your mind wander" and I daydreamed about a job at PsychoGenix.
Afterwards I saw the fMRI images corresponding to faces, words, lines, etc. They only had a resolution down to 2 mm, so active regions looked like symmetric clumps of squares on the screen.

Voting with your votes is much more effective than the fake choice presented in wallets.

This is a liberal district. Just look at who it elects. We all gravitated to the OWS in the East Bay because we were too busy to set one up here, releasing products for people to use when documenting abuse at the hands of riot police. Nyaah.

On behalf of my sovereign nation, the United States of America: I hereby make a territorial claim upon the entire surface of the larger of these two planets, and 75% of the temperate latitudes of the smaller one, wherever they are.

Bonehead,

You aren't going to get one over on me with your highschool chem. Fluoride salts form transient HF covalent bonds in water that interfere with biochemical electron transport mechanisms.