Late Middle Ages

King Arthur is a myth. See for an extensive explanation: http://en.wikipedia.org/wiki/King_arthur

A possible answer is to be found at Nisbet:"as one of the points of calibration of Nisbet's vision on history, the transition between the Middle Ages and the Modern Era stands, in which both should be less seen as easy discernible...

No, why should they! The modern human (Homo sapiens sapiens) is around for about 37,000 years. Ever since, people have the same appearance and the same development of the brain as we do...

Crannogs varied in size but it would probably be an extended family of parents, grand parents and children, aunts uncles, cousins, etc. Crannogs were used from 5,000 years ago to as recently as 250 years ago, so the number of people staying there would have changed as the function of crannogs changed.

The heat of a fire depends on the type of fuel and the quantity of added oxygen. A simple wood fire can reach about 700 - 800 ° C.

Nowadays, strict fire safety rules are set at parks like Archeon. Therefore, in all houses, we have fire extinguishers present. The city council in medieval times, however, already applied rules.

At the beginning, a suit of armour was meant for battle and a knight who fell off his horse should be able to continue fighting. In the 14th and 15th century, one could move around in a suit of armour pretty well...

A complete suit of armour of a knight in the late 13th and early 14th century weighed about 30 to 35 kilogrammes. To us, this may seem heavy, but a knight was used to carry his equipment from very young childhood on...

A medieval suit of armour weighs between 25 and 40 kilograms.

Yes. One should realise, the potential enemy was under fire of arrows and stones when trying to conquer the ditch and tall fence.