What are those things that have a series of peaks and troughs moulded into plastic that when rubbed ...?
931599
We used to have those when I was a kid.  They looked like a long piece of thin plastic - much like a Ty-Wrap cable tie - with serrated plastic teeth all the way down.  When you ran your thumb nail down the entire thing you could hear whatever was 'recorded' onto it quite clearly.  The used to be given away free in cereal boxes back in the 70's.  We had Mickey Mouse, Donald Duck and Action Man ones.  They used a kind of pulse width modulation, the 'peaks' were always the same height but spaced at varying distances.  They were quite common for a while but I haven't seen one for a long time.    I think they were called "Talking .... somethings", sorry can't be more helpfull.
911225
Engineering, plastics, metals. reinforcing bars.
414634
Well plastic is a polymer.  A polymer is a big huge molecule that is made up of repeats of smaller molecules linked together.  You can think of it like a train.  The polymer is the whole train and each of the smaller units is a car in the train.  To make plastic, you perform the chemical reactions that link the train cars together.  Then you perform some process to shape the plastic into the object you want.  Usually that process involves hot plastic that you just made and a mold that you put the hot plastic into.  There are many different types of plastic and the differences between them are which train cars are used in the train and how they are linked together.
645368
They are cast onto flat aluminum, then molded. Not so difficult.
80066
Pieces of white plastic barrels.(and some black paint)
1053911
Plastic and paper.\nI stuff one inside the other repeatedly just to torture the recycle people.
108172
Its more like filling a plastic bottle with water and squeezing. you get a 'Fountain' of water and then some trickling over the side.
426477
I have no idea why they are so called, but a tesselating pattern is one which repeats with no gaps. Tiled floors are a good example, from the basic squares to the more complicated tiled floors seen elsewhere
472255
go to wikipedia and search mold
769571
Rubber. PVC, oil (special types), mica, porcelain, tufnell, glass, teflon, silica, shellac, special varnishes in motors, and hundreds of different tyes of plastics.
918098
plastic pvc plastic with thousands of little rubber bands wrapped around a little ball with water in it thats the core . throw one in the fire and stand back. its pretty cool
1178425
no theyre actually made of plastic that is colored a specific color\nand theyre not 3x3 theyre rectangular so more like 4x3
1065447
substances that have crystallization water trapped inside their molecules :D
193778
Which plastic resin?  There are many types. \n\nBig plastics corporations include Bayer, BASF, DuPont, GE, Cytec, Solvay, etc, etc, etc...\n\nSee the link\n\nhttp://www.ides.com/manufacturers/default.htm
250246
they're called veneers and bleaching
440362
I would guess it is made from rapid prototyping:- Fused-deposition modeling.  It technique is call Extrusion of melted plastic. there is more information that you can find. Just keep looking..
160423
Segregating plastic, metal(cans) , and other garbege from each other and processing it separately.