#19,,, Firstly the epoxy resin mixes with the catalyst contained inside the smaller vial within the ampule and forms an epoxy, this spreads around the rebar or bolt and is mixed along with the grit also encased. bond is stronger than the brick or rock it is inserted in,

No oxygen required

Great post.

12 and 13 have the same answers. Hate to use 13 on my fingers

#16 It's a nesting house for Carpenter Bees. They're great little pollinators! They bore into wood, usually dead wood instead of live trees.

#10, symbol is a 'trezoob', which means 3 teeth, and is upside down in this image.

#6 looks more like a lobster than a crab.

#13 I don't want to use #13 as a acupressure ring for my fingers :D

I thought #12 was a cockring