The most convincing explanation is that when someone is finding it difficult to understand what is said to them, he/she engages in a form of lip-reading: he/she will observe the lips of the talker and mimic the talker's lip movements.
Lake Tanganyika is an African Great Lake. It is estimated to be the second largest freshwater lake in the world by volume, and the second deepest, in both cases, after only Lake Baikal in Siberia; it is also the world's longest freshwater lake.
Speke accomplished this in 1858, while on an expedition with Richard Francis Burton to locate the source of the Nile River. With a surface area of 68,800 square kilometres (26,600 sq mi), Lake Victoria is Africa's largest lake by area, and is also the largest tropical lake in the world.Lake Victoria is the world's second largest freshwater lake by surface area; only Lake Superior in North America is larger.ake Victoria is drained solely by the Nile River near Jinja, Uganda, on the lake's northern shore. Lake Victoria occupies a shallow depression in Africa and has a maximum depth of 84 m (276 ft) and an average depth of 40 m (130 ft). Its catchment area covers 184,000 square kilometers (71,040 sq mi).