Setting "sights", not "sites".

And how many of us run food-grade lubricant in our bike pumps? I think I'll pass on this.

[I assume the compressed air is bearing down directly on the water reservoir. If there is an isolating diaphragm or piston I might reconsider.]

Paul:

That would be the Cobra Mk I, or Mk III. As we all know, the Mk II never made it out of the factory.

Yes, Elite stole much of my childhood :).

I cannot resist attempting a comment.

@#3:
"it isn't Voltage that kills ... Amperage kills"

That argument has always bothered me. Your body is a Thevenin equivalent circuit. So is whatever you propose to electrocute yourself with. The current and voltage applied to your body are inextricably linked. It takes lots of volts to push lots of amps through you.

The doorknob zap does put many amps through your finger. The saving grace there is the very short duration.

The danger with this knife switch is not so much electrocution as it is burns. If the switch contacts become contaminated or oxidized then the whole assembly may become very hot. There's a reason microswitches have largely replaced knife switches. They are much less prone to melting.

In the collection of 18 pictures, that is the only one that contains a dog. I'm not qualified to comment on whether it pertains to dog fighting, but that is certainly not the theme of the set.

Many Soviet/Russian spacecraft, from Sputnik to present day, are pressurized. It means that they can use fan cooling, and not worry too much about component outgassing or tin whiskers. The bulkhead also provides thick radiation shielding, which is handy as their spacecraft have often occupied high dose orbits such as the Molniya.

I'm not sure if the article made it clear, but the pressure sensor on Sputnik was intended to detect hull puncture.

The disadvantage of a solid hull, besides the large mass, is the need to run all of your electrical connections to the outside world through hermetic feed-throughs.

I must say, the non-violent silk mystified me.

First, the silkworm pupa is undergoing a complete metamorphosis from caterpillar into moth. Once it wraps itself up it generates digestive enzymes that reduce most of its body to acellular soup. At this point it's alive in the same way that a just-fertilized chicken egg is: just a couple of living cells and a whole mass of food for them.

Second, if allowed to proceed unmolested it will hatch into an adult moth. This has no functional mouthparts, and will die within a day. All it can possibly hope to achieve is to mate and (if female) lay eggs. Each will lay 200 to 500 eggs. I don't see how the non-violent folks can let each one reproduce, and then not kill any of the eggs, or we'd have a silkworm population bomb.

@#2: When money suddenly disappears from your account, you will know that Ninja Air has chosen you as an investor.

Wow. That's an hour well spent. Thanks for the link.

Significant figures, please! If it's 10 mm long, it's 0.4 inches. Unless you really mean that every adult frog is exactly 0.3937 inches long.