This tactile feedback is related to a difference in tis-sue density as one goes from the parenchyma to the vessels or from the parenchyma to the collecting sys-tem, and also to the selectivity of the CUSA to spare tissue of high collagen content.
1 In the least developed countries, the overall illiteracy rate is 49 percent. 2  52 percent of all non-literates live in India and China. 3  Africa as a continent has a literacy rate of less than 60 percent. 4  In Sub-Saharan Africa since 1980, primary school enrollment has declined, going from 58 percent to 50 percent.
How many Africans were taken from Africa through enslavement? There are no complete records and estimates vary from a few millions to 100,000,000 people. Most historians today think that, according to the shipping records available, between 9 and 11 million people were taken out of Africa by European slave traders and landed alive on the other side of the Atlantic. One researcher gives the higher, very detailed figure of 11,863,000.