Duckweed (that green film) is a must have in at least one of my water gardens (yes, now there are multiple water gardens)... did you know you can eat it? And that it has TONS of protein? Thank you Doomsday Preppers for that little gem. :-)
I saw a discussion on ways to secure your home... Preppers were cutting chain link fencing the sizes of all their windows & door openings, if SHTF, fencing can be quickly bolted to each opening using very long lag screws, having angle iron cut to length it would be even better. It would greatly slow down intruders, anything thrown would bounce off & not break glass. Attach to doors so you could talk to someone & they couldn't rush in (one of the most often used entry tactics).