You probably don't think about soil often, but the following report may help you learn about science of soil.

What is soil made of?

Soil is made of sediments (沉积物) and humus(腐殖质). Sediment is small pieces of rock broken down over time by rain, ice, and wind. Sediment is often found in water. Humus comes from decayed(腐烂的) plants and animals. It helps give plants a lot of the food they need to grow.

How does soil form?

Over centuries, rock breaks down into very small pieces.

The rock pieces mix with humus.

The humus gets thicker and thicker over time. Soil is formed(形成)l

How are soils different?

Soils can be different colors and have different textures(质感). Texture is how the surface of an object feels. Color and texture are two features(特征) of soil.

Plants and soil

Plants do not grow well in some soils. Sandy soi1 is too dry. It does not hold water. Soil with too much clay is too thick. Most plants grow well in dark, rich garden soil that has different sediments and a lot of humus in it.

    Some people seem to have extraordinary (非凡的）memories. Zheng Aiqiang, a “memory athlete” on TV show Super Brain, can remember 2,660 numbers in just one hour!

    You would think people like this have special brains. But according to a recent study by researchers from the US and the Netherlands, the brain structures（结构）of ordinary people and 23 of the world's leading memory athletes show no difference.

    That's because good memories can be trained. New research in the journal Neuron (神经元期刊) suggests that you can become a super memorizer with just six weeks of hard training.

    Researchers found that technique (技巧）called loci, invented by ancient Greeks, can greatly help improve memory. By using loci, you are using your imagination to improve the brain's memory networks. You can link（关联）something you need to remember with a place that you know very well. For example, to remember a list of numbers, imagine yourself walking through your house. Each thing is linked to a number. For example, zero could be handle（把手）on the door and five could be the painting on the wall.

    In one study, some ordinary people were given 20 minutes to remember 72 words. First they could only remember 26 of them. But when they were taught loci, they could remember 62 words.

    “Not everyone can become a memory champion. But everyone using the technique can improve a lot from the level they're at,” said Boris Konrad, one of the researchers in the study.

A. Nobody has lived over 400 years

B. She is the one who sells the candy

C. It's the heat that kills it

D. Everything you told me went in one ear and out the other

E. This boy cried so terribly that he scared four other patients out of the office

The Amazing Spider Man

    Spider Man is a hero. People got to know the hero through the Spider Man movie series.

    Now, a new Spider Man movie is coming to our eyes. It has a new name called The Amazing Spider Man. A new director called Marc Webbis directed the movie and a new actor, Andrew Garfield, played Spider Man.

    The Amazing Spider Man is also about the story of Peter Parker, a high school student. His parents left him when he was a boy, and he was raised by his Uncle Ben and Aunt May. Like most teenagers, Peter is trying to figure out who he is and how he got to be the person he is today.

    As Peter finds a briefcase that belonged to his father, he begins to find out why his parents disappeared. The discovery of his father's secret will shape his destiny(命运)of becoming “Spider Man.”Peter will make his choices to use his powers and become a hero.

    Unlike the former one, the new movie focuses on Spider Man developing his abilities in high school, as well as discovering the mystery(秘密)of his parents, or at least what happened to his father.

    The movie is going to come out on July 3, 2012 in 3D.

You are what you eat

    Keeping better eating habits can help you reduce (减少) disease (疾病). A healthy eating plan means choosing the right foods to eat and preparing foods in a healthy way.

    ____________

    Do you often change your toothbrush？Maybe you think it is not necessary. A study shows old toothbrushes bring disease. You should often change your toothbrush.

    Exercise

    Swimming, running, skating, skiing, dancing, walking and some other activities can help you stay healthy. You should exercise at least three times a week and for twenty minutes or more each time. Do it.

    Plan out your life

    You should have breakfast before you go to school. Have a proper (合适的) meal for lunch. Follow a healthy diet.