Why does storing a diluted acid in a tank connected to metal pipes/fittings make a fire/explosion hazard?
From a practical point of view straight rather than curved arms are much better to put on under a helmet. From a safety point of view if there is no visor you might want to consider ballistic protection glasses as a stray stone flicked up by a car or van could shatter normal glasses with horrid consequences.
It will be rather unique in some people's routines and activities; on the more common individuals use, the principles will be quite general and generic (albeit name brand products) since accepted methods are hammered out daily with the only variation being improvements and updates in the security software and security products. Really I have not come across any new approaches but the utilities improve while pretty much doing the same things. This will sound silly but it is an example I am going to use anyway (as I am no security expert). If computer viruses start floating down from entrails or rising from crop circles to find their way into our computers, that certainly would be very alien. That is not happening, at least I have not heard of it!
Gravity is the force of attraction between two objects that each have some kind of mass to them. Newton's Law of Universal Gravitation states that any object with mass has gravity. The only thing with that fact being stated is that EVERYTHING with mass has gravity, including something as small as a paper clip for example. So, if two paperclips were floating along in space, they would be gravitationally attracted towards one another (at a very slow rate, however).
I completely agree with Tim D. Aside from having your Ray Bans behind your face shield; in the event of a collision or just going down, you want to have eye protection that is listed as Shatter Proof. Picture the ugly part of this; small glass shards in your eye(s) that a Dr. can't even see to try to remove them. There are a lot of choices out there for tinted eye ware.
These They have ballistic lenses, so rocks aren't a problem, the foam eyecups snap in/out, so they can be used as goggles (the temple pieces snap out, and are replaced by an elastic headstrap), or sunglasses
