Christmas dinner at Bruce Sweetser and Denali Delmar’s house will come in part from their backyard garden. And this retired couple will add another locally grown delicious food to their menu.

“We started harvesting road­killed deer last year，” Bruce explained. His fridge is filled with meat harvested from deer killed in car accidents. Bruce and his wife think it is a right road toward a greener life. Their idea might best be described as locavorism (本土膳食主义). And they believe that eating local food is healthier and better for the environment.

About two years ago, the couple ran across a car accident. The only victim was a deer. And then they found an interesting list by chance.

In Massachusetts, many deer always rush to the motorway and often cause the accidents. So some Massachusetts police departments keep lists of people interested in harvesting meat if a deer isn’t damaged too much after a run­in with a car. There are eight people on the Westford Police Department’s official list. In addition, animal control officials also call people to harvest the meat.

But Massachusetts law requires that the driver of the car get first right to the deer. If the driver or passengers don’t want to get the deer, then police can give the animal to people living in Massachusetts. In other words, they can go to the list.

Bruce and his wife weren’t on the Westford list, when they came across that first deer in 2009. But now, they are, and they have harvested three deer as a result, putting the extra meat in the fridge for regular dinners and special occasions like Christmas.

A blow-fly (绿头苍蝇) was looking for an ideal place to lay eggs, like rotting meat, so that when her little maggots (蛆) were born, they could feed on the meat.

As she turned a corner in the grassland, she smelt something stinking in the air. The smell of rotten meat! With great joy she perched on it and laid her eggs. She was happy that her children would have enough food to eat.

The blow-fly did not know she had made a great mistake. What she had sat upon was not meat but a flower, which stinks. It is called a carrion flower (牛尾草). So, when the blow-fly’s eggs hatched and the little maggots came out, they had nothing to eat. They died of starvation.

The carrion flower is one of the many flowers which give out dirty smells to attract flies. The Rafflesia stinks like rotting meat, while the tropical Lords and Ladies flower gives out a smell like rotting fish.

They do it for a special reason. Unlike mating birds, these plants cannot move from their place. But it is important for the male cell of one plant to get in touch with the female cell of another plant. Once that is done , the seed of the plant will bloom and give birth to another plant.

The plant uses its stink to attract flies. As soon as the blow-fly sits on the flower, it is captured by the flower with strong hair. When the hair falls, the fly is free to fly, but it takes some pollen (花粉) with it. And goes and sits on another plant. The male cell of one plant meets the female cell of the other. The seed gets new life.

How long could you stand on Antarctic ice before your bare feet froze solid? A minute. Maybe two? If you’re an emperor penguin, you can do it for two months in cruel winds at as low as-75 degrees Fahrenheit【小题1】, but their special circulation acts as a kind of antifreeze to keep them warm enough.

Penguin legs and feet have evolved to lose as little heat as possible. Penguin feet preserve heat by restricting blood flow in really cold weather, keeping foot temperature just above freezing【小题2】

Blood vessels to and from the feet are very narrow and woven closely together, cooling the blood from the body on the way to the feet and heating the blood as it returns to the body.【小题3】 .

This special ability is part of how penguins keep their eggs warm until they hatch. Each penguin egg’s father balances it on his feet and covers it with his very warm layer of feathered skin to keep it cozy while females are out feeding at sea.【小题4】. If females haven’t returned with food by time the chicks hatch, male penguins feed their babies for a few days on a kind of "milk" made from special cells inside their throats.

【小题5】Your hands get whiter during freezing weather because there 's less blood in them which has been redirected to the central part of your body to make sure vital organs stay warm.