What type of stone was replace in the 17th and 18th centrury? Answer the above question based on the context below: The White Tower is a keep (also known as a donjon), which was often the strongest structure in a medieval castle, and contained lodgings suitable for the lord in this case, the king or his representative. According to military historian Allen Brown, "The great tower [White Tower] was also, by virtue of its strength, majesty and lordly accommodation, the donjon par excellence". As one of the largest keeps in the Christian world, the White Tower has been described as "the most complete eleventh-century palace in Europe". The White Tower, not including its projecting corner towers, measures 36 by 32 metres (118 by 105 ft) at the base, and is 27 m (90 ft) high at the southern battlements. The structure was originally three storeys high, comprising a basement floor, an entrance level, and an upper floor. The entrance, as is usual in Norman keeps, was above ground, in this case on the south face, and accessed via a wooden staircase which could be removed in the event of an attack. It was probably during Henry II's reign (11541189) that a forebuilding was added to the south side of the tower to provide extra defences to the entrance, but it has not survived. Each floor was divided into three chambers, the largest in the west, a smaller room in the north-east, and the chapel taking up the entrance and upper floors of the south-east. At the western corners of the building are square towers, while to the north-east a round tower houses a spiral staircase. At the south-east corner there is a larger semi-circular projection which accommodates the apse of the chapel. As the building was intended to be a comfortable residence as well as a stronghold, latrines were built into the walls, and four fireplaces provided warmth.The main building material is Kentish rag-stone, although some local mudstone was also used. Caen stone was imported from northern France to provide details in the Tower's facing, although little of the original material survives as it was replaced with Portland stone in the 17th and 18th centuries. As...
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Answer: Caen stone

Who tried in vain to overcome the wind? Answer the above question based on the context below: "Paradise!" wrote Andree. "Large even ice floes with pools of sweet drinking water and here and there a tender-fleshed young polar bear!" They made fair apparent headway, but the wind turned almost as soon as they did, and they were again being pushed backward, away from Sjuyane. The wind varied between southwest and northwest over the coming weeks; they tried in vain to overcome this by turning more and more westward, but it was becoming clear that Sjuyane was out of their reach. On 12 September, the explorers resigned themselves to wintering on the ice and camped on a large floe, letting the ice take them where it would, "which", writes Kjellstrom, "it had really been doing all along". Drifting rapidly due south towards Kvitya, they hurriedly built a winter "home" on the floe against the increasing cold, with walls made of water-reinforced snow to Strindberg's design. Observing the rapidity of their drift, Andree recorded his hopes that they might get far enough south to feed themselves entirely from the sea.However, the floe began to break up directly under the hut on 2 October, from the stresses of pressing against Kvitya, and they were forced to bring their stores on to the island itself, which took a couple of days. "Morale remains good", reports Andree at the very end of the coherent part of his diary, which ends: "With such comrades one should be able to manage under, I may say, any circumstances". It is inferred from the incoherent and badly damaged last pages of Andree's diary that the three men were all dead within a few days of moving onto the island.
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Answer: the explorers

What is the full name of the person who threatened to expel Taylor? Answer the above question based on the context below: The day after the Young Turks' press conference, Taylor privately met Khanh at the latter's office. He complained about the dissolution of the HNC and said it did not accord with the values of the alliance and the loyalty Washington expected of Saigon. He added that the US could not cooperate with two governments at once: a military regime that held power while a civilian body took the responsibility. Khanh testily replied that Vietnam was not a satellite of the US and compared the situation to the US support of the successful coup against Diem, saying that loyalty was meant to be reciprocated. Khanh had hinted that he felt the Americans were about to have him deposed like Diem, who was then assassinated, but this rankled Taylor, who had argued against the regime change. Taylor then bemoaned Khanh, saying he had lost confidence in the Vietnamese officer, recommending Khanh resign and go into exile. He also said military supplies currently being shipped to Vietnam would be withheld after arriving in Saigon and that American help in planning and advising military operations would be suspended.Khanh bristled and said "You should keep to your place as Ambassador ... as Ambassador, it is really not appropriate for you to be dealing in this way with the commander-in-chief of the armed forces on a political matter, nor was it appropriate for you to have summoned some of my generals to the Embassy yesterday." He threatened to expel Taylor, who responded by saying a forced departure would mean the end of US support. However, Khanh later said he was open to the possibility of going abroad and asked Taylor if he thought this would be good for the country, to which the ambassador replied in the affirmative. Khanh also said he took responsibility for his generals' actions, and expressed regret at what they had done. Khanh then ended the meeting, saying he would think about his future.Later, Khanh phoned Taylor from his office and expressed his desire to resign and go abroad along with several other generals, asking for...
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Answer:
Nguyen Khanh