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Bacteria can be grown in the laboratory on nutrient culture media, but viruses need living cells in which to replicate. Many vaccines to infectious diseases can be grown in fertilised chicken eggs. Millions of eggs are used each year to generate the annual flu vaccine requirements, a complex process that takes about six months after the decision is made as to what strains of virus to include in the new vaccine. A problem with using eggs for this purpose is that people with egg allergies are unable to be immunised, but this disadvantage may be overcome as new techniques for cell-based rather than egg-based culture become available. Cell-based culture will also be useful in a pandemic when it may be difficult to acquire a sufficiently large quantity of suitable sterile, fertile eggs.

How long does it take for the flu vaccine to be fully ready for deployment into the population ?
Answer: process that takes about six months
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Throughout the second half of the 19th century, child labour began to decline in industrialised societies due to regulation and economic factors. The regulation of child labour began from the earliest days of the Industrial revolution. The first act to regulate child labour in Britain was passed in 1803. As early as 1802 and 1819 Factory Acts were passed to regulate the working hours of workhouse children in factories and cotton mills to 12 hours per day. These acts were largely ineffective and after radical agitation, by for example the "Short Time Committees" in 1831, a Royal Commission recommended in 1833 that children aged 1118 should work a maximum of 12 hours per day, children aged 911 a maximum of eight hours, and children under the age of nine were no longer permitted to work. This act however only applied to the textile industry, and further agitation led to another act in 1847 limiting both adults and children to 10-hour working days. Lord Shaftesbury was an outspoken advocate of regulating child labour.

In 1833 at what age was the limit to working in a textile industry factory?
Answer: children under the age of nine
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Britain's remaining colonies in Africa, except for self-governing Southern Rhodesia, were all granted independence by 1968. British withdrawal from the southern and eastern parts of Africa was not a peaceful process. Kenyan independence was preceded by the eight-year Mau Mau Uprising. In Rhodesia, the 1965 Unilateral Declaration of Independence by the white minority resulted in a civil war that lasted until the Lancaster House Agreement of 1979, which set the terms for recognised independence in 1980, as the new nation of Zimbabwe.

When was the second-to-last British colony in Africa granted independence?
Answer:
1968