Yours sincerely

Li Hua

When I was a child growing up in the Netherlands, I often begged my mother to tell me this story about an experience her family had at the end of World War II.

During the terrible last winter of the German occupation, food was scarce in the Netherlands. People were so hungry that they began to eat small animals and many things not normally considered edible (可食用的), including tulip bulbs (郁金香球茎), which could be cooked like potatoes.

For centuries, my mother’s family had owned a highly successful tulip business, which provided jobs for many in our village. But the war shut their business down, and during the winter of hunger, my grandfather, Albert, donated all his tulip bulbs to feed the hungriest villagers. For years, Albert had been trying to grow a black tulip. By careful selection, he was very close. So he guarded these few bulbs carefully to prevent people from stealing them for food.

One day, it was announced that the war was over. But there was much destruction and the Dutch people still faced dangers. My grandfather looked at his pale, thin children and realized that the hunger could continue for a long time, so he made his decision. He seized a shovel (铁铲) and went into the garden. There he found my mother, Vivian, who was just seven years old, looking nervous. Over her shoulder, Albert saw a band of Germans coming toward them down the street. He whispered to Vivian to run inside the house and began digging for his bulbs. But it was too late. Someone had already stolen them. Angry and desperate, Albert ran toward the street screaming, “They have stolen my tulip bulbs!” Vivian, watching from the doorway, cried out and ran to stop her father. Before she could reach him, Albert stumbled and fell, badly hurting his leg.

I’m very glad to have received your e-mail.

Yours,

Li Hua

9 . Black taxis have been a common sight in London for many years. Now these taxis and their drivers have become the focus of a new study into Alzheimer’s (阿尔兹海默症). For those on the outside, it may seem that behind the wheel of these black taxis are just common people who help move us to our places. But hidden within their brains is a map of London’s streets that has put GPS technology to shame for many years.

“The knowledge”, the test for London’s taxi drivers, stands among the hardest tests one could ever experience. It includes remembering information repeatedly from the memory of minute details about between 25,000 and 56,000 streets in London, depending on who’s taking the test, from the Trafalgar Square to the tiniest residential lanes (居民巷).

Usually, the hippocampus (海马体) feels the influences of Alzheimer’s most. The hippocampus controls the brain’s short-term memory and spatial memory (空间记忆) systems. University College London and Alzheimer’s Research UK are coming together to study these taxi drivers’ brains. And the taxi drivers’ hippocampi continue to grow as they go on doing the job for more years. This suggests that perhaps there’s something we can do to reproduce the influence on the general population.

Lead researcher Hugo Spiers was part of the team which 20 years ago found that, like birds’, the taxi drivers’ hippocampi slowly got bigger. In fact, research has found for years that any animal that requires detailed spatial knowledge of their land experiences growth in the hippocampus.

Spiers’ team hopes to deal with Alzheimer’s by studying the taxi drivers’ brains, since the hippocampus becomes smaller with the development of Alzheimer’s. To collect more information, Spiers has asked thirty London’s taxi drivers connected to an MRI machine to drive around. The machine will allow the researchers to keep a real-time watch on the workings of the hippocampus. “It’s been a joy to help scientists fight the disease,” said taxi driver Robert Lordan.

Yours,

Li Hua