One day, you open the fridge and find some moldy (发霉的) food. But before you can throw it away, your mother stops you. She doesn't want to waste food. She cuts off the moldy part and eats the rest. Is it safe to do this?

Mold (霉菌) can grow on almost all kinds of food. Mold is usually green, white, black or gray. Mold makes food soft and changes its color. Moldy food tastes quite bad and it's not safe to eat.

If you find mold in soft food, just throw it away. Soft food, such as bread, tomatoes and hot dogs, usually contain (包含) water. This allows mold to easily grow below its surface. Bacteria (细菌) also grows along with it.

It's OK to cut the moldy parts out of hard, food and eat the rest. But if the food is completely covered with mold, you should still throw it away. Most kinds of mold are bad for us. But some kinds of mold can be used to make food. For example, penicillin(青霉菌) can be used to make many types of cheeses, such as blue cheese. These cheeses are safe to eat and they're quite delicious as well.

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Different weather makes people feel different. It influences (影响) health, intelligence (智力) and feelings. In August, it is very hot and wet in the southern part of the United States. People there have heart trouble and other kinds of health problems during this month. In the Northeast and the Middle West, it is very hot at some times and very cold at other times. People in these states have more heart trouble after the weather changes in February or March.

The weather can also influence intelligence. For example, in a 1983 report by scientists, IQ of a group of students was very high when a very strong wind came, but after the strong wind, their IQ was 10％ lower. The wind can help people have more intelligence. Very hot weather, on the other hand, can make it lower. Students in many schools of the United States often get worse on exams in the hot months of the year (July and August). Weather also has a strong influence on people’s feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have a hard time in hot summer. At about 18℃, people become stronger.

Low air pressure may make people forgetful. People leave more bags on buses and in shops on low-pressure days, People feel best at a temperature of about 18℃. Are you feeling sad, tired, forgetful, or unhappy today? It may be the weather’s problem.

Can dolphins talk? Maybe they can’t talk with words, but they can talk with sounds. They show their feelings with sounds.

Dolphins travel in a group. We call a group of them a “school”. They don’t study, but they travel together.

Dolphins talk to other dolphins in the school. They give information. They tell other dolphins when they are happy or sad or afraid. They say “welcome” when a dolphin comes back to the school. They talk when they play.

They make a few sounds above water. They make many more sounds under water. People can’t hear these sounds because they are very high.

Sometimes people catch dolphins for large aquariums(水族馆). People can watch the dolphins in a show. Dolphins don’t like to be in an aquarium, being away from their school. They are sad and lonely if they do so.

There are many stories about dolphins. They help people. Sometimes they save someone’s life. Many people believe that dolphins can bring them good luck.