Can I take a bow and arrows on the train in the UK? I'm interested in taking up archery. Attending the closest club would require that I take the train there as I cannot drive. Would I be able to take a bow and arrows, secured in a case, on the train? The train operator is Northern Rail in the UK.
If the train operator allows it, yes, you would be permitted to do so. There are no laws specifically against the carrying of bows and/or arrows, nor is a licence required for their purchase. Bows can be carried openly with less issue, but arrows (because of their ease of use as a weapon) should be stored securely and safely, because this protects you and others from accidental injury; it prevents others using the arrow as a weapon; it is affirmative evidence for a defence of lawful purpose, if you are accused of carrying an offensive weapon. The latter is the greatest risk you may face from a legal perspective, so you should follow best practise similarly to firearms and ammunition: store and transport the bow and arrows safely, securely, separately.
Everything is allowed unless the law says it isn’t Common law systems like the USA are ‘exceptions based’ - the law permits everything except what it prohibits. So, your question is backwards - rather than looking for laws that allow it, you need to look for laws that prohibit, restrict or regulate it. There are laws that regulate this but none that prohibit it.
Doing nothing is legally safer than doing something, but you're not without hope if you pull the lever. Although you'll likely have committed murder or at least manslaughter, case law is littered with lenience in exigent circumstances, even where convictions have been affirmed. Because this is a philosophical problem, there are plenty of opinions from that perspective, but not so many from a legal standpoint. Let's assume that you're an innocent bystander, (not an employee of the railway company or the train company, etc) and have no duty to act. If you do nothing, then it is unlikely that you would be charged with a crime - you had no duty to fulfill, and therefore not negligent. There's little doubt that not pulling the lever is the safer option. More interesting is when you choose to pull the lever - then it's probable that you would have charges of murder, or at least manslaughter, brought against you by the state. What defenses does the law offer? Let's assume that you are aware that pulling the lever will kill a person. The primary defence is a legal principle of necessity: where your criminal actions are not protected or excluded by some other statute or principle, the fact that you were obliged to take this action in order to prevent some greater harm may safeguard you from penalties. There are certain elements of necessity: That you did not create the danger that caused you to commit the crime; That you ceased the criminal activity as soon as practicably possible; That you had no reasonable alternative; and The harm that you prevented was greater than the harm that you caused. I see such a defense only possibly falling over on (4), where the prevented and caused harm, in the case of human lives, are inherently very subjective. Unfortunately, each state has different rulings regarding the threshold for evidence of this defense. One of the most famous cases where necessity was attempted as a defense to murder, with remarkable parallels to this hypothetical, is that of R v Dudley and Stephens: A crew of four found themselves on a lifeboat at sea with no food and no water, and with no prospect of rescue. One of them was a child (Parker) and was nearing death and unconscious. Two of them (Dudley and Stephens), after some discussion over drawing lots, decided that the child would be killed before his natural death, in order that his blood be better preserved for drinking. The last crew member, Brooks, was silent on the matter. After killing Parker, Dudley, Stephens and Brooks fed on Parker's body. During the trial, the matter of necessity as a defense to murder was considered. The judges found that there was no common law defence of necessity to murder, and Dudley and Stephens were sentenced to death with a recommendation for mercy. The Home Secretary commuted their sentences to six months' imprisonment. This case concerns essentially the choice you're making in the trolley problem: either the four crew members were going to die, or one of them would definitely die and the others might live. It's easy to say that they should have just waited, but they didn't have the benefit of hindsight. It's also a great example of a situation where although the law says one thing, it doesn't align with our morals and ethics, and while it's a UK case, I would wager that almost every lawyer in common law countries would have heard about it.
All Four of them! Double Jeopardy is not in play if a jurisdiction can lay claim to your criminal action, so if you stand on the Four Corners and shoot a man in any of the four states, each state has a right to charge murder. In addition, the Federal Government can have a go at you because you crossed state lines while in comission of a crime. Plus the Navajo Nation, which controls the reservation land the border is on. So that six separate charges. That said, the state the dead body occupied at time of Murder would have the best case for action and the other three would likely let that state try you first. The Feds would only step in if each of the four states failed to convict, though they can step in whenever they want (they are just watching to see if you'll serve time first). Not sure at which point Tribal jurisdiction applies, but given that this is a fairly common Jurisdiction issue, I'm sure it's been worked out.
"Public space" is not a relevant criteria when considering trespass or other crimes/torts against property. The relevant criteria is who owns it and what they allow you to do on it. All land in the USA is owned by someone. That someone may be a government; that does not make it a public space - Camp David is owned by the US government; it is certainly not public. The owner of the land can decide (subject to the law) who has access to their land and in what circumstances. If they erect a fence then they are saying "You cannot access my land here" - if you ignore this then you are trespassing. This is true even if there are legitimate ways to access the land i.e. there is a place where there isn't a fence; to avoid trespass you would have to access the land from there. If you think of this in terms of a public building like a courthouse you are free to enter through the unlocked front doors but not by climbing through a window. The trespass is in the act of crossing the fence - that is the act that you have been implicitly denied permission to do. Being on one side or the other is not trespass. For the specific image that you show it is quite likely that those roads are owned by different people - the highway is probably owned by the state while the cul-de-sac is a local government road.
Can the subject actually sue me in England, or is it possible to sue only in the EU country I posted the article from, or in the US where the article is actually hosted? Yes. If the online encyclopedia is available in the UK, then you have libelled them in the UK and, indeed, in every country where it is available. They can choose to sue in and under the laws of any country where they were libelled. If the subject can and does sue in England, what happens exactly? This is laid out in the Civil Procedure Rules Am I correct in presuming that I will be notified of this by mail and asked to enter a defence? You will definitely need to be served with the Particulars of Claim, however, this may come by other methods than snail mail. If so, what happens if I ignore the matter? Will a default judgment against me necessarily be entered, or will the court duly consider the plaintiff's case, perform the bare minimum investigation/reasoning necessary to determine which arguments of theirs are (un)sound, and so possibly rule in my favour? A default judgement will be entered providing the Particulars of Claim show a cause of action on its face. The court will not examine any evidence or enquire into the veracity of the statements made on the Particulars of Claim. In short, unless the plaintiff has ballsed something up - you lose. If I do choose to respond, can I hire an England-based lawyer to handle everything remotely, or can I be compelled to physically attend the court in England? You are generally not required to attend court in a civil matter unless you need to testify. Even then, arrangements can be made for remote testimony. If the court rules for the plaintiff and awards damages, can this judgment be enforced in the EU, or would it apply only in the UK? It can be enforced in the EU. As a courtesy or by treaty, domestic jurisdictions will enforce foreign judgements in most cases. If the court rules in my favour, would I recoup my legal fees? You will probably recoup some but not all of your legal fees, say 50-60%. Costs orders are complicated - talk to your lawyer.
There are many regulations to consider, for the firearms themselves, the permits needed by potential customers, and licensing you will need as a business dealing with firearms and ammunition. Start with the Home Office: https://www.gov.uk/search?q=firearms I.e., https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/479794/Guidance_on_Firearms_Licensing_Law_Nov_2015_v16.pdf
In the US, it is illegal to sell screwdrivers to Gaza without a license, see 31 CFR 595.409. There are numerous rules pertaining to the Palestinian Authority staring here. Dept. of State has a partial list of countries and their associated restrictions, if you want "like Gaza", and note that they warn you that this is not a complete list. If you are specifically interested in weapons-related restrictions, the US Munitions List is here. There is no generic "anti-drone" system, so you would have to look at the specifics of a system to see if it is on the restricted list, or not.