Expert Computer Science Quiz: RSA, Binary Search, Knuth, Unix
Expert computer science quiz on the RSA inventors, binary search complexity, The Art of Computer Programming, Ruby's creator and Unix's birthplace.
African countries, peoples and landscapes
The Africa theme explores a continent of more than 30 million square kilometres: the Sahara, the Sahel and the savannah, the Congo rainforest, the Nile delta, Mount Kilimanjaro, Lake Victoria, the Rift Valley and the Namib Desert. Questions also cover capitals such as Nairobi, Dakar, Addis Ababa and Pretoria, major rivers, languages, peoples and key moments of African history, from the medieval empires of Mali and Ghana to the wave of independences.
Every Africa quiz is free and runs across five difficulty levels, from very easy to expert, with an explanation after each answer so that you remember what you have learned. It is a handy way to revise the geography of the continent, place countries on the map and discover places and traditions that are often poorly known.
Expert computer science quiz on the RSA inventors, binary search complexity, The Art of Computer Programming, Ruby's creator and Unix's birthplace.
A hard computer science quiz: the first programmer, the Internet's ancestor, the lab behind C, IPv4 address size and the imitation game. 10 questions.
Intermediate computer science quiz: the inventor of the World Wide Web, the Linux kernel's creator, SQL, binary 1010 and the S of HTTPS. 10 questions.
Easy computer science quiz: who founded Microsoft with Paul Allen, a snake-named language, what HTML does, the CPU acronym and bits in a byte.
A very easy computer quiz: the cursor device, the maker of the iPhone, web browsers, where the @ symbol is used and what USB stands for. 10 free questions.
Mount Kilimanjaro is in north-eastern Tanzania, close to the Kenyan border. This volcanic massif rises to about 5,895 metres at Uhuru Peak, the highest point in Africa. Despite sitting near the equator, its summit is capped with ice, which has been shrinking markedly.
The Sahel is a semi-arid belt that stretches east to west between the Sahara in the north and the wetter savannahs in the south, from the Atlantic coast (Senegal, Mauritania) to the Red Sea region. It has a short rainy season and a long dry one, which makes farming and herding fragile.
1960 is nicknamed the Year of Africa: seventeen countries gained independence, including Senegal, Mali, Ivory Coast, Nigeria, Madagascar and the Congo. Most were former French colonies, and the wave was part of a decolonisation movement that ran from the 1950s to the 1970s.