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While this does not fit the topic 100%, I recomment the question of "How would nanobots consume objects?" due there is some info, which is related. worldbuilding.stackexchange.com/questions/3894/…
Too late for edit; I meant "opium" of course, not "optimum". red poppy seeds are better I think. Opium is the better painkiller, and poppy is easier to cultivate then hemp. You don't have to select the female plants. If you miss to cut the male plants before they can mate, your entire yield is waste. However, seeds don't need a lot of space, so why not both?
What exactly shall the marijuana be good for? Painkiller? Better use optium. Long term threadement for cancer or such? You won't be able to determinate of you have cancer, at all. Useless. Best of what I can think about: Drugs should be awesome trading goods. For myself: Not useful. I'm not capable of handling situation while on marijuana. Same with opium of course, but opium kills any pain for sure, while marijuana does not.
Better don't include "a lot" of axes, due they're very heavy and take a lot of space in the fridge. Better include "a lot" of axeblates, only 1-2 with stick. Additional some large nails. With an axe, several axeblades and some nails, you only have to find some sticks to build as many axes as you have blades.
If you don't do this, you'll have two problems: #1: The Energygain might not be at it's optimum. #2: The Antimatter will "eat" your engine over time, because it just reacts with the very first particle it mets which could be a part of your engine.
Not that simple. As the antimatter leaves the accellerator, it will react instantaneously due it will find matter in that very moment. But you probably want the antimatter to hit specifific matter, not the first on its way. So basicly you need another accellerator (which is way simpler because it doesn't have to keep a field up when not needet). Both accellerators have to shot their particles (the matter and the antimatter) simultaniousely towards each other in a vacuum at its best.
Sweden, Denmark, Germany, Netherlands, and many others in Europe have one thing in familiar: education is free. Still, education is very good. There are perfect examples for very good and very bad public schools as like the opposite.
Not within 20 years as asked for, but birth control can be very effective as you can see in China. Their birthrate is droping for decades and by 2035-2040 more people will get to old to work than young people get old enough to work. (At least they said that in the french/german polit show >Mit Offenen Karten<)
