1982-ish and previous pennies were 97.5% copper. You can tell the difference by the sound they make when dropped on a hard surface.

The following is from Ted Molczan, an expert on satellites and launches and a major contributor to the seesat-l list. There's a good change of seeing a fuel dump from a Delta 4 medium if you're in the right place at the right time.

WGS 5 is scheduled for launch from Cape Canaveral on a Delta 4 Medium+(5,4) in about 11 hours, on 2013 May 24, between 00:27 and 00:57 UTC.
http://www.spaceflightnow.com/delta/d362/status.html
I offer the following rough TLE of the orbit after the final burn of the 2nd stage, assuming launch at window-open:
SECO-2 440 X 66991 km
1 78901U 13144.04069444 .00000000 00000-0 00000-0 0 02
2 78901 24.0048 67.6288 8299446 177.8402 1.4113 1.08160032 04
Following spacecraft separation, observers within range should look for the following 2nd stage events (times
approximate):
        T+ UTC
00:45:00 01:12:00 CCAM Start (Collision and Contamination Avoidance Manoeuvre)
00:47:20 01:14:20 CCAM End
00:54:41 01:21:41 H2 Depletion End
00:56:40 01:23:40 O2 Depletion End
01:18:33 01:45:33 N2H4 depletion End

The fuel dump could produce a spectacular comet-like phenomenon, similar to that of WGS 4, imaged last year despite
challenging conditions by Willie Koorts: http://satobs.org/seesat/Jan-2012/0270.html

The following is from Ted Molczan, an expert on satellites and launches and a major contributor to the seesat-l list. There's a good change of seeing a fuel dump from a Delta 4 medium if you're in the right place at the right time.

WGS 5 is scheduled for launch from Cape Canaveral on a Delta 4 Medium+(5,4) in about 11 hours, on 2013 May 24, between 00:27 and 00:57 UTC.
http://www.spaceflightnow.com/delta/d362/status.html
I offer the following rough TLE of the orbit after the final burn of the 2nd stage, assuming launch at window-open:
SECO-2 440 X 66991 km
1 78901U 13144.04069444 .00000000 00000-0 00000-0 0 02
2 78901 24.0048 67.6288 8299446 177.8402 1.4113 1.08160032 04
Following spacecraft separation, observers within range should look for the following 2nd stage events (times
approximate):
        T+ UTC
00:45:00 01:12:00 CCAM Start (Collision and Contamination Avoidance Manoeuvre)
00:47:20 01:14:20 CCAM End
00:54:41 01:21:41 H2 Depletion End
00:56:40 01:23:40 O2 Depletion End
01:18:33 01:45:33 N2H4 depletion End

The fuel dump could produce a spectacular comet-like phenomenon, similar to that of WGS 4, imaged last year despite
challenging conditions by Willie Koorts: http://satobs.org/seesat/Jan-2012/0270.html

Almost no-one knows nothing about guns. They may not know as much as you'd like, but most people know something.

Sadly it seems most of this firearm 'knowledge' is obtained from watching movies, not from taking a safety course and heading down to the range. Most of what they 'know' is more like what they think they know to be true.

What about a mechanism that disables the gun if it detects that an unauthorized person is trying to use it?

I came here to say exactly this. I'd put my children's and all their friends prints in the 'do not fire' category as an added layer of defense against them getting access to one of my firearms until they're of an age to safely and responsibly handle a weapon.

Buy a shaker of "no-salt" (KCl)

You realize that the K40 in that no-salt is already radioactive, right? From the article:

"An adult human body contains about 160 grams of potassium, hence about 0.000117 x 160 = 0.0187 grams of 40K; whose decay produces about 4,400 disintegrations per second (becquerels) continuously throughout the life of the body."

Designing a microwave link below 50 GHz where the path loss is at most 0.2 dB/km is MUCH easier than designing one that can range from 3dB/km to 40dB/km. For every km of path, 37dB of dynamic range/headroom is a factor of around 5000x (closer to 5012, actually). If you need 1W to achieve your desired S/N ratio in dry air (3dB loss) over 1 km, you'll need 5kW when it's raining. Make that 2 km and you go from needing 2W (6dB loss) to needing 50 MW (yes, megawatts at 80dB loss).

Even if the required signal levels are 3 orders of magnitude lower (i.e. 1mW will work over 1 km of dry air) you will still need ridiculous amounts of power past a few km. Even at 2 km you're looking at 50kW at 80dB/2 km.

We haven't even considered the reflectivity/opacity of leaves/plants/etc if you're proposing this for "last mile" use. You'll need a very clear line-of-sight path for this.

Also, washing with alcohol would likely be as effective or possibly more so, but the downside is dryness.

Can you say Hand Sanitizer? 60-85% alcohol, typically.

I can never find organic irradiated ground meat.

Easy - grind your own! Buy the cut(s) of beef you like, and grind away!

This band is not useful for long haul carriage due to atmospheric water vapor absorption. According to this chart, absorption between 200 and 280 GHz varies between 3 and 40 dB/km. That means at the low end only 50% of your signal is absorbed every km. At the high end, only 1/10,000th of your signal remains after each km.

this post speaks to similar issues including refraction.

Germination rates in the area of our facility with wireless access are roughly half of that on the other side of the shed...

There are other variables involved, like whether the sun shines more on one side of the shed (raising the temperature on that side), whether the door is nearer one side or the other, etc. Without validating the other scenarios (no wifi anywhere = germination everywhere; wifi on the other side = swapped germination; wifi on both sides = no germination), your 'data' is nothing more than a coincidence.

As an amateur radio operator I regularly deal with MUCH higher power levels at similar frequencies* - I have never seen any such result, so my 'data' offsets yours.

*We are allowed to transmit with up to 1500W PEP in the same band as Wifi, namely 2300-2450MHz (with gaps). There are no limits to the gain of the antennas we use, so we could easily have an EIRP in the 10's of megawatts. I can legally run a microwave oven with the door open.

If my experience is relevant, it started when the first male human reached about two years of age. That's when my brother and I started throwing spears at each other, at least.

In addition to all of the other comments, the liquid may well be acting as a neutron moderator, preventing criticality in the solid. These tanks are _very_ dangerous - some are right on the edge of criticality and must be stirred and some must be cooled to prevent self-boiling.

Check out the Banana-equivalent dose. Bananas and other high potassium foods are naturally radioactive. Brazil nuts are not only high in Na "... but also radium [and] may have up to 444 Bq/kg" - that's a third of the limit from naturally occurring radiation in food.

Your body's natural Na undergoes 5400 decays every second of your life.

PS - perhaps add enough of that nasty polymer absorptive stuff to stop further mixing/movement before vitrification-in-place?