According to newspaper reports the Board of Directors of the Sugar Development Corporation (SUDECO) suspended in May seven senior officials following the loss of Shs 2.7 billion worth of sugar. Three officials in the Finance Department of the Mtibwa (Morogoro) sugar factory have been sacked far ‘failure to prevent embezzlement of funds by subordinates’. The Minister for Science, Technology and Higher Education has announced that 179 civil servants had been sacked and 53 suspended for receiving bribes between January and May. The Minister of Justice and Constitutional Affairs has stated that two magistrates have been dismissed and 40 others suspended in connection with corruption allegations.

The Minister for Communications and Transport was reported in the Daily News at the beginning of May as having suspended the Director General of the Directorate of Civil Aviation for alleged indiscipline and insubordination.

More VIP’s have been in Tanzania enjoying its tourist attractions. South African Deputy President Thabo Mbeki and his wife spent 11 days on the beach and at national parks in June, not long after a similar visit by King Harald and Queen Sonja of Norway.

Among recent study visitors to London has been Mr Elias Songoyi, Lecturer in Oral Literature and Drama at the University of Dar es Salaam. He has described to Tanzanian Affairs the fluctuating fortunes of two Tanzanian singers in their relations with the Tanzanian state during the last 40 years. One, known as Kalikali, who has since died, was from Kwimba; the other, known as Mwinamila, who is now 67, is from Tabora. Their lives and their art have gone through four distinct phases according to the political climate at the time, Mr Songoyi said.

In the pre-independence period singers were popular figures, both through their singing and though their position as medicine men. Kalikali used to sing about work, about politics, about people’s problems. The language of the songs was figurative, full of light hearted jokes and wit. The songs were also narrative, containing elaborate descriptions of people, things and events. Society was criticised. During the colonial period this freedom of expression was constantly threatened, but nevertheless, it managed to survive. When the independence struggle began, singers like Kalikali, and especially Mwinamila, joined with enthusiasm with their songs praising Nyerere and the TANU party he had established. But three years after independence, Kalikali became disillusioned. His songs reflected what the peasants were thinking (translated from the Kisukuma):

My skin is itching
I cannot stop scratching myself
I had harvested much cotton
But the price fell
Paul, the son of Bomani
Never turned to look back
He does not care for the peasant

Another of his songs spoke of ‘Area Commissioners/ your buttocks getting fat’ – a reference to their getting fat on the money collected for public works. Kalikali was seen to have gone too far. In 1965 he was detained in Butimba prison where he was kept incommunicado for two months before being released by order of President Nyerere. We don’t know exactly what happened during his detention but Kalikali learnt that the state was not a thing to be played with. When he came out, his songs were very different. A new phase had started which continued until the eighties. The song he sang soon after his release sounded repentant and resigned:

I brought suffering
To my children and my wives (4)
When I spoke about the price of cotton
That was my mistake
I shall not say it again
I shall never repeat……

By 1967 Kalikali was singing the praises of the Arusha Declaration and Nyerere. But his audience had changed. It was no longer the peasants. He was more and more addressing party and government officials. He started singing in Swahili as well as Kisukuma. One of his songs – a very long and detailed one – coincided with the visit in 1971, on the invitation of President Nyerere, to former British administrators:

Welcome back Englishmen
Come and see how Tanzania has become
We parted peacefully
We did not quarrel Englishmen
Schools are in every village…..

Kalikali’s counterpart, Mwinamila, was not detained; instead he received rewards for his singing. A house was built for him and he was given employment by the TANU party. He still works in the Cultural Affairs Department of the CCM even though he had also been very critical of the government in the 70’s and 80’s. By 1988 he was singing about the Walanguzi (the racketeers) who, in his view, were among the party and government executives.

Why was one artist detained and not the other? Mr Songoyi said that the relationship between artists and the state is often complex. In these two cases timing was important. Kalikali became critical in his singing when the state was still insecure, not long after the army mutiny in 1964. Mwinamila’s criticism coincided with the campaign against ‘economic saboteurs’ in the early 1980’s. Mwinamila also benefited from his close association with Nyerere whom he had known since 1954. Kalikali had no friends in high places. Their audiences differed. Following Sukuma dance tradition, Kalikali performed in the open where many people could attend. His songs were seen to be contagious, and, in the view of those in power, he had to be stopped from acting ‘in a manner prejudicial to peace and good order’. He had to change the nature of his songs; jokes, provocation, insults were no longer there. Mwinamila, being close to the party, was not a threat. He became a professional singer – the ‘crude’ language was out.

Next came the period of ‘liberalisation’ in 1985. Socialism seemed no longer to be the ideology. The gap of the state on artists was relaxed. Singers could express different ideas. Themes were no longer primarily political. Social relationships came to figure more prominently in the songs.

Now, in the 90’s, there have been more changes. Almost a full circle but in a different way. Party politics is now widely featured. But the main difference is that most singers are young and have been through primary education. They are no longer as conversant as the older singers with the artistic use of Kisukuma in their songs. Swahili words appear intermingled amongst older style phrases.

One wonders – could the next step be singing in English?

(Someone else who is closely involved in Sukuma and other cultural pursuits is Dr James Matunga, the owner of a herbalist clinic in Dar es Salaam, who is the chairman of a Society registered on January 25, 1997 under the title ‘Jumuiya ya Kuhifadhi na Kuendeleza Mila na Desturi za kiTanzania’ (to preserve and maintain Tanzanian customs) He has recently been touring Sukumaland and meeting vast crowds enthusiastic about restoring respect for traditional music and dancing. Among those who have been supporting this initiative have been the then Minister of Health, Mr Mayagila and Prince Rohert Lega, the son of the former Paramount Chief Majebele Masanja – Editor)

COMMON SENSE, awareness, vaccination and avoidance is the self-evident message. Knowing your own blood group could be useful. Taking needles and syringes and having a good travel insurance are important.

VACCINATION should be taken against Tetanus, Diphtheria, Polio, Typhoid, Hepatitis A and Yellow Fever. Vaccination against Hepatitis B, Rabies and Meningitis A & C may be indicated for longer term travellers and backpackers. Cholera vaccine is not very effective.

MALARIA has no effective vaccine so anti-malarial tablets must be taken. Three regimes are suggested: a) chloroquine 2 tablets weekly and paludrine 2 tablets daily (75% effective); b) mefloquine 1 tablet weekly (90% effective); c) doxycyline 1 capsule daily (75% effective). There is a lot of publicity surrounding mefloquine (Lariam) but it was our choice for a recent trip. Side effects are quite rare and usually show early, so start 3 or 4 weeks before going to see how you tolerate it.

PREVENTION OF BITES is also vital. Mosquitoes bite at night and prefer sweaty feet! Use screens and a pyrethrum impregnated sleeping net. Cover exposed areas. Use DEET insect repellent. Avoid sluggish water (Schistosomiasis) and fast running water (river blindness) so, no swimming, except in the ocean! Wear walking boots (snakes, bites, blisters).

TRAVELLERS DIARRHOEA is extremely common. It is normally self limiting with full recovery within a few days. Wash your hands, avoid untreated water, ice cubes, ice cream and raw fruit and vegetables unless they have been peeled. The mainstay of treatment is taking plenty of clear fluids (bottled drinks, clear soup) but powdered proprietary preparations of salt and sugar for reconstituting in boiled water are best (e.g. Dioralyte). The anti-biotic Ciprofoxacin is effective in helping most causes of the problem. Loperamide (imodlum) is a good anti-diarrhoreal.

Michael and Jo Nelki

Although it created temporary chaos all round the country the government stuck to its guns and insisted that from March 1 every bus authorised to carry passengers must have a speed governor fitted to limit speed to 60km/hour. Garages worked overtime as bus owners left the fitting of the governors to beyond the final date.

Wilson Kaigarula the satirical ‘Sunday Mail’ columnist wrote about his fellow journalist’s experiences:

• Since daladala buses were not operating Star reporter Mike Lukumbo decided to cycle to the city. He could have hired a cab but, since his pockets and money are on hostile Mobutu-Kabila-like terms, he couldn’t afford it. This would have the double advantage of impressing his editor that he is a dedicated reporter and would also enable him to trim his size to the Tanzania average …. He is the extreme opposite of a slim man. And that’s what caused the problem. After one kilometre, the old bicycle broke into two equal pieces. Lukurnbo suffered a king-size hip damage and was ferried … to Muhimbili by good Samaritans in a wheelbarrow which a cement dealer by the road had volunteered … to pick up a cab in the wake of the transport crisis would have cost 100,000/-.

• A distant voice – like the distant drums of Jim Reeves – told Sukhdev Msabaha that it was not for nothing that he had scored an A in his fourth form mathematics exam. He calculated that he could use his father’s seven-tonne tipper to make quick money …. half a minute after parking the tipper at the bus stand … it was filled with seven tonnes of illegal passengers, each of whom paid 500/- in advance. But half way through the journey the truck developed mechanical problems. He tried to revive it but to no avail. The passengers noisily demanded a refund of their fares. But the money was too sweet to surrender, so the mathematician-journalist calculated that he could solve the problem dramatically. He engaged the special gear that facilitates the contents of a tipper to spill backwards … .in the chaos he fled the scene ….

Recent visitors to Tanzania have included Prince Charles and his two sons Prince William and Prince Harry who went to the Selous and other game parks and Mrs Hillary Clinton and daughter Chelsea who visited a USAID community-based development project in Arumeru district before going on a private visit to Ngorongoro and the Serengeti National Park.

Midst severe criticism from the UN Secretary General, the UN High Commissioner for Refugees and Amnesty International, Tanzania has defended its action in deporting 126 Burundi refugees who were later massacred by Burundian soldiers. Minister of Home Affairs Ali Ameir said that Tanzanian forces rounded up 157 Burundians who were engaged in factional fighting and had defied an order to turn themselves into Tanzanian police. Instead, they opted to return home after being identified as trouble makers by their fellow refugees. They were members of two radical Hutu groups fighting against the Tutsi-dominated Burundi government. The return to Rwanda of 500,000 Hutu refugees from Ngara and Karagwe was completed between December 14 and 29, 1996.

Tanzania, ice cream and international scientific controversy wouldn’t win many points in a word association game. But add the name ‘Mpemba’ and there is a link. ‘Tanzanian Affairs’ has uncovered a mystery that began in ancient Greece, resurfaced in 1960’s Tanga and has since ricocheted around university labs the world over.

And we exclusively trace the Tanzanian boy at the centre of the puzzle. His name now fills reruns of scientific journals but at the time he was mocked by his classmates as the ‘black sheep’ of the class.

Erasto Mpemba was the ‘black sheep’. He takes up the story in ‘Physics Education’. “In 1963 when I was in Form 3 in Magamba Secondary School, Tanzania I used to make ice cream. The boys at the school do this by boiling milk, mixing it with sugar and putting it into the freezing chamber in the refrigerator …. a lot of boys make it and there is a rush to get space”. One day Mpemba began boiling milk but another boy dashed to grab the space. Rather than miss his chance Mpemba acted rashly. “I decided to risk ruin to the refrigerator on that day by putting hot milk into it”. His gamble led to a strange discovery.

“The other boy and I went back an hour and a half later and found that my tray of milk had frozen into ice cream while his was still only a thick liquid not yet frozen.” The gamble paid off, but set in motion a chain of events that went far beyond a cool lick in sweltering Tanga town.

Mpemba had discovered a phenomenon that had been observed before but never explained. Sometimes, against all our intuitions, warm liquid freezes faster than cold.

Aristotle noticed this in the fourth century and wrote: ” … many people when they want to cool water quickly begin by putting it in the sun … “. Mpemba said that the ice cream makers of Tanga were among them. Before ice cream was even thought about in Tanga, and almost two millennia after Aristotle, the French philosopher Descartes observed: “… water which has been kept for a long time on the fire freezes faster than other water”. Twenty years before the English civil war Francis Bacon noted the same. So did scientist Marliani in Renaissance Italy.

But the mystery remained unsolved, tossed aside by the scientific community like a stone in the shoe of the new physics which could not explain it. Mpemba put the stone back.

But before the world would take notice another person entered the story. Six years after Mpemba’s discovery, Denis Osborne, Professor of Physics at the University of Dar es Salaam, went to speak in Mkwawa High School. Osborne recalls in ‘Physics Education’ that he faced a variety of questions from students: “How do I get to University?”, “What does the syllabus have to do with development?” but almost thirty years later one question still sticks in his mind.

“Why did hot water freeze more quickly than cold?” Mpemba was persistent – he had asked this question before. His first physics lesson on arriving at Mkwawa High School was on heat. Mpemba recalls the scene:

“One day as our teacher taught us about Newton’s Law of Cooling, I asked him the question “Please Sir, why is it that when you put both hot milk and cold milk into a refrigerator at the same time, the hot milk freezes first?” The teacher replied: “I do not think so, Mpemba”. “1 continued: It is true, Sir, I have done it myself’. And he said: “The answer I can give is that you were confused.” “I kept on arguing, and the final answer he gave me was that: “Well all I can say is that Mpemba’s physics is not the universal physics”.

“From then onwards if I failed in a problem by making a mistake in looking up the logarithms this teacher used to say: “That is Mpemba’s physics”. And the whole class adopted this, and any time I did something wrong they used to say to me “That is Mpemba’s …. whatever the thing was”.

Despite ridicule Mpemba adopted a pitbull-like persistence. Once he stole into an empty lab and ran through an experiment with beakers of warm and cold water and again found the same result. When Denis Osborne turned up at the school, he thought he might at last get an answer. Mpemba continues: “He first smiled and asked me to repeat the question. After I repeated it he said: “Is it true? Have you done it?” I said: “Yes”. Then he said: “I do not know but I promise to try this experiment when I am back in Dar es Salaam.” Osborne recalls: “It was a surprising question. I thought he was wrong. On my way back to Dar es Salaam in the car I worked out that he must be wrong in theory.” But Osborne held true to his promise Although Mpemba’s classmates would soon be laughing on the other side of their faces, they continued to rib him. “Next day, my classmates in Form 4 were saying to me that I had shamed them by asking that question and that my aim was to ask a question that Dr Osborne would not be able to answer. Some said to me: “But Mpemba, did you understand your chapter on Newton’s law of cooling?” I told them: “Theory differs from practical”. Some said: “We do not wonder, for that was Mpemba’s physics:’

Osborne was surprised when a technician at University College in Dar tried the experiment and he saw the results. He set about trying to explain them, coming up with a few possible explanations, and publishing material in various journals.

Recently the debate was re-ignited in the pages of the ‘New Scientist’ – exposing the same scepticism faced by Mpemba.

Norman Gardiner in Cheshire wondered whether Mpemba knew that his name had entered the language and that scientists were still debating the question that he put to Professor Osborne 30 years later. Charles Knight of the National Centre for Atmospheric Research in Boulder, Colorado recommended readers of the ‘New Scientist’ to read a paper which had been published in ‘The Transactions of the American Philosophical Society’ in 1948 under the heading ‘The Freezing of Supercooled Water’ but J Jocelyn from the Scottish Universities Research and Reactor Centre warned readers that this extended to 80 pages! Tom Trull from the University of Tasmania wrote: “This is a cultural myth.” But his colleague Michael Davis from the same university countered: ” … it is possible to produce ice cubes more quickly by using initially hot water instead of cold”. Matti Jarvilehto at the University of Oulu in Finland. writing in the New Scientist’s ‘Last Word’ section, reported on a similar effect in an electric sauna. “By fooling the temperature sensor by splashing water I increased the oven’s output” he wrote.

With the controversy having been re-opened in Tanzania by Mpemba the solution could come from elsewhere in Africa. South African physicist David Auerbach working in Germany thinks he knows the answer.

“It’s all to do with super cooling” Auerbach was reported as saying in the ‘New Scientist’ in late 1995. After 103 experiments he found that the Mpemba effect is not an iron law – sometimes warm water and sometimes cold water freezes first. The explanation lies in branching ‘ferns’ of ice. These shoot out from the walls of beakers full of water as it just begins to freeze. Auerbach says that this is a sign of super cooling. The Mpemba effect occurs with this super cooling. The sudden appearance of ‘ferns’ of ice crystals from the super cooled liquid occurs at a higher temperature in water that was originally hot. This means that warm water can freeze quicker than cold.

But will Mpemba’s discovery lead to any new inventions? Osborne is not sure. “Among other things the effect is quite erratic. It depends on random vibrations and wafts of air so you get different effects on different occasions.” This could limit its practical applications. Yet whether the Mpemba effect solves the world’s energy crisis or patches the hole in the ozone layer it undoubtedly affected the people involved.

“Surprising questions are fun. They are not to be despised,” says Osborne. “One piece that’s to my credit is that I did not despise, I went off and researched it.” Osborne has pursued a distinguished career in science education. Mpemba’s life has followed a different path since the two parted company in 1969 after they published their joint paper in ‘Physics Education’.

FINDING ERASTO MPEMBA
Finding a one-time physics student in a country the size of Tanzania seemed, at first, like a daunting task. But after tracking down Professor Osborne in Britain, the task became straightforward as they had remained in touch with each other. In Dar es Salaam, after a tip off from a Security guard at the Ministry of Natural Resources and Tourism, we tracked him down to the “Ivory Room” in Changombe, Dar es Salaam. This is where the big annual sale of Tanzanian ivory used to be held before marketing the tusks was banned. Ivory is still stored there from elephants that are damaging crops and have to be killed.

Mpemba’s work with wildlife means that he is no stranger to elephants. “We were on control work in Dodoma some years ago” he said. “We met a big herd. The leader dominating the herd was tuskless. They were ruining peoples crops. He had to go. But he decided to die with us”. “I aimed between the eyes. He went down. He stood up again and charged. I shot him again at 50 yards. I shot him for a third time, a fourth time. A fifth time. He was over my head. As he finally fell, his body grazed my leg.”

But run-ins with elephants were not what Mpemba always had in mind. Originally he wanted to be a doctor but his parents did not have the money to pay for the training, he said. Seeing work with wildlife as the best way to an overseas scholarship he ended up at the Mweka Wildlife College. After getting his diploma he was promoted to Regional Natural Resources Officer in Mara Region in 1967. It was eight years before he achieved his ambition of foreign study. In Australia he got a degree in Natural Resources Management. Today Mpemba is Principal Assistant Game officer working with communities to involve more people in conservation.

Funnily enough his wife is a doctor. But science does not seem to run in the family. “And your children, are there any budding physicists among them?” we asked. “No. They are not doing at all well in physics” he replied. Mpemba may have done more for science than science has done for him. Osborne says: “He is slightly cynical about the whole thing and says people are making too much fuss about it. He did badly in his physics exam”. But if the Mpemba effect does lead to some new advance it will not be a first for Africa. “Some aspects of environmental science and drugs taken from natural sources are being pioneered by Africans and people in other developing countries,” says Osborne.

And Mpemba’s lesson is more than just about the properties of water. How many students in the high tech labs of British schools have made a similar contribution to science understanding? And how many teachers have dismissed students who go against the textbooks? The “black sheep of the class” may have done badly in his physics exam but he has taught a lesson to students and teachers the world over.
Matthew Green

(The heavily guarded Ivory Room is still in use. 144 elephant tusks, disguised as boat spare parts and believed to be from the mainland were recently seized at Zanzibar airport. This brings the total stock of ivory in the Room to some 60 tonnes worth $6 million. The fate of this ivory is to be decided at the Convention on International Trade in Endangered Species meeting in Harare in July – Editor).

The tortoise is threatened with extinction in Zanzibar because they are being taken away for sale to ships in Dar es Salaam harbour. But now, according to the ‘Business Times’, they are to be provided with special devices to be implanted in the shells which will respond to the touch and so trigger a signal directly to a monitoring centre to show that the animal is probably in trouble. It is one of the new technologies being used to protect endangered species the world over.