【推荐1】Food sometimes gets poisoned(中毒) with harmful things. A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious, but some types are deadly. The symptoms of food poisoning usually begin within hours of eating the poisoned food. Fever is one of the most common symptoms.

Certain microorganisms(微生物) cause most types of food poisoning. Bacteria and other microorganisms can poison eggs, meat, vegetables, and many other foods. After entering the body, these tiny living things release(释放) poisons that make people sick.

Some chemicals(化合物) can also cause food poisoning. They are often added to food while it is being grown, processed, or prepared. For example, many farmers spray chemicals on crops to kill weeds and insects. Some people may have a bad reaction to those chemicals when they eat the crops.

Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.

When people handle food properly, the risk of food poisoning is very small. Microorganisms multiply rapidly in dirty places and in warm temperatures. This means that people should never touch food with dirty hands or put food on unwashed surfaces. Food should be kept in a refrigerator to stop microorganisms from growing. Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it. Finally, people should not eat wild mushrooms or other foods that grow in the wild. Some of these foods may contain natural materials that are poisonous to humans. In addition, some types of fish can be poisonous.

Most people recover from food poisoning after a few day of resting and drinking extra water. If people eat natural poisons, they must go to the hospital right away to have their stomachs emptied.

【推荐2】When our Scottish puppy reached doggie adolescence, she suddenly stopped obeying my commands. Previously, if I called “come,” Annie would fly across our yard to my arms. Now, the 8-month-old gave me an aggressive “make me” look and ran the other way.

Our dog trainer advised us to stop complaining. “She's a teenager,” she said. Now, a new study is backing that up: Dogs, it says, experience an oversensitive period just like human teenagers. “There is abundant folk knowledge that the behavior of adolescents differs from younger or older dogs,” says Barbara Smuts.

Puppies bond with humans much as children do. “But owners often feel like they're failing when their puppies reach adolescence,” about 8 months for most dogs, says Lucy Asher. Like teenagers, adolescent dogs can disregard and disobey their owners. Indeed, teenage dogs are the most likely age group to land in U.S. shelters.

To see exactly how adolescence changes dog behavior, Asher and her team monitored 70 female dogs being raised as potential guide dogs. They asked caregivers to score the puppies on separation-related behaviors, like trembling when left behind. Dogs with high scores on this behavior entered adolescence earlier-at about 5 months, compared with 8 months for those with lower scores. Various factors cause human teenage girls with poor parental relationships to also enter adolescence at a younger age. Thus, similar to humans, dogs that have bad relationships with their caregivers see changes in their development.

According to Smuts, adolescent dogs that were stressed by separation from their caregiver also increasingly disobeyed that person, showing the insecurity of human teenagers.

Because of the similarity between adolescent pups and humans, dogs can serve as a model species for studying adolescence in humans, the scientists say. The temporary nature of dogs which disobey the owners may make us worry less when our pups suddenly get minds of their own.

【推荐1】History of amusement parks takes us back to the bar-periodic fairs, like the Bartholomew Fair which started in England. These can be considered a parent for the modern amusement park. Opening in the Elizabethan period, the fair had developed as a center of amusement with entertainment with fun, food, games, and many other attractions. The beer festival held in Munich, Germany which started in 1810 and the country and state fairs in the US, also played a part in the brief history of amusement park. Unlike the Bartholomew Fair, these annual events were usually held during an important time when crops were ripe, which deserved to be marked.

Amusement parks are also known to have grown out of the pleasure gardens that became very popular at the start of the Industrial Revolution. These were the zones where one could shun the dull urban life for a short while. We can find the oldest and still-surviving amusement park in the world: Bakken in Denmark, which opened in 1583. These parks consisted of fireworks displays, rides and the modern railroad to accommodate the growing expectations from their customers.

Another turning point in the history of amusement parks was the world’s fairs which began in 1851. The Crystal Palace in London, England was a landmark and celebrated the industrial achievements of the world. These were seen as symbols of economic and industrial success. In the last decade of the 19th century, the electric trolley lines became extremely popular. Mechanical amusements, dance hall, sports fields, and restaurants were included as regular entertainments, as the history of amusement parks reflects.

The golden age in the brief history of amusement parks didn’t appear until people especially Americans spent less time on work and got a steady rise in their personal income. A number of amusement parks including the Kiddie Park were set up outside major cities and in the countryside, to make full use of this new economic opportunity. The original Kiddie Park is located in San Antonio, Texas and is still in operation today.