Context and question: In the Kingdom of Holland, the British launched the Walcheren Campaign to open up a second front in the war and to relieve the pressure on the Austrians. The British army only landed at Walcheren on 30 July, by which point the Austrians had already been defeated. The Walcheren Campaign was characterized by little fighting but heavy casualties thanks to the popularly dubbed "Walcheren Fever." Over 4000 British troops were lost in a bungled campaign, and the rest withdrew in December 1809. The main strategic result from the campaign became the delayed political settlement between the French and the Austrians. Emperor Francis wanted to wait and see how the British performed in their theater before entering into negotiations with Napoleon. Once it became apparent that the British were going nowhere, the Austrians agreed to peace talks.
The Walcheren Campaign was intended to relieve the military pressure on whom?
Answer: the Austrians
Context and question: In the context of relativity, mass is not an additive quantity, in the sense that one can add the rest masses of particles in a system to get the total rest mass of the system. Thus, in relativity usually a more general view is that it is not the sum of rest masses, but the energy–momentum tensor that quantifies the amount of matter. This tensor gives the rest mass for the entire system. "Matter" therefore is sometimes considered as anything that contributes to the energy–momentum of a system, that is, anything that is not purely gravity. This view is commonly held in fields that deal with general relativity such as cosmology. In this view, light and other massless particles and fields are part of matter.
What can the energy-momentum tensor not do?
Answer: unanswerable
Context and question: Other microscopic procedures may also aid in identifying infectious agents. Almost all cells readily stain with a number of basic dyes due to the electrostatic attraction between negatively charged cellular molecules and the positive charge on the dye. A cell is normally transparent under a microscope, and using a stain increases the contrast of a cell with its background. Staining a cell with a dye such as Giemsa stain or crystal violet allows a microscopist to describe its size, shape, internal and external components and its associations with other cells. The response of bacteria to different staining procedures is used in the taxonomic classification of microbes as well. Two methods, the Gram stain and the acid-fast stain, are the standard approaches used to classify bacteria and to diagnosis of disease. The Gram stain identifies the bacterial groups Firmicutes and Actinobacteria, both of which contain many significant human pathogens. The acid-fast staining procedure identifies the Actinobacterial genera Mycobacterium and Nocardia.
How many methods comprise standard approaches used to classify bacteria and diagnose disease?
Answer:
Two