Article 33 of the Magna Carta states, "All fish-weirs shall be removed from the Thames, the Medway, and throughout the whole of England, except on the sea coast." Before I write anymore about that, let me tell you about something else.
About 1,000 years ago, English fishermen, or perhaps a disruptive technologist who was not a fisherman, figured out a way to catch fish that probably beat out every other way. It works like this: You make an artificial reef in a V shape out of rocks, with the point of the V facing toward the direction that the tide flows out. The reef is about as high as the surface of the water during low tide. At the point of the V, you make a little gap so that some water can escape. When the tide comes in, fish hang out around the reef, and well... they hang out. But when the tide rolls out, the fish get caught in the V. They try to squeeze through the gap to escape, but you can stick a net there. If you make the gap really small, the fish all get stuck near the exit point and you can just scoop them up with a bucket as they crowd around.
These V things were called fish-weirs, and they were so good at trapping fish, that the local fish populations started to drop. Thus, the English Barons who drafted the Magna Carta decided to ban them from everywhere, except ones in the Ocean.
I grew up in the United States, and the only thing we ever learn about the Magna Carta is that it was a document that limited the power of the English King, eventually paving the way for English Common Law, and other familiar non-Monarchal things. They never told us that the Barons who wrote the thing also wanted to ban fish traps, or that there "shall also be a standard width of dyed cloth, russett, and haberject, namely two ells within the selvedges." Anyway, the whole point of this post was to mention that someone found an ancient fish trap by using Google Earth.