What's the difference between ​The Dog bit Jim​. and ​Jim bit the dog​?​ What's the difference between ​Joe eats the lobster.​ and ​The lobster eats Joe?​ The words used in the sentences are exactly the same. The difference is the way they're arranged. The meaning of the experience is determined by the order of the signals provided to the brain. It's like the commands to a computer. If you program the commands in the right order, the computer will use all its capabilities and produce the result you desire. If you program the correct commands in a different order, you will not get the outcome you wish.

Q. What is the main idea?

  An ideal garden soil comprises particles of sand and clay which are held together by humic acid. Compost, which is made up of decaying organic matter, helps these particles to form. Compost increases the soil's water-holding capacity. So a soil rich in compost will need less watering, and the plants growing in it will better withstand drought. Compost is filled with microbes, which break down the organic matter in soil into basic elements plants need. Because it is made up of decaying vegetable matter, compost contains nearly every chemical plants need to grow. Moreover, because it is so dark in color, compost absorbs the sun's rays and warms the soil.

Q. What is the main idea?

  There are two bookstore salespersons, Joe Doaks and Jane Blivens. A customer comes to Joe's register to check out. "Hey, I saw the book ​Ike and Monty: Generals at War​ on your shelf," he says. "I'm reading it. It's really great." Joe looks at him blankly, keeps working the register, and mutters, "Uh huh" in total and final acknowledgement. Jane Blivens is at the register. Same customer. Same line, about the book ​Ike and Monty,​ etc. Jane responds, "That's great. What did you like about it?" The customer gives a 45-second description, completes the transaction, and leaves. What has Jane done? She's lit up the customer by paying attention. She's also picked up some valuable information. When another customer comes in looking for a good, new nonfiction book, she's got a lead, "Well, one of our customers just told me he liked ​Ike and Monty.​" You'd better try to be like Jane.

Q. What is the main idea?

  When some plastics are melted and combined for recycling, the polymers in the plastic - the chains that make it strong and flexible - shorten. Since the material properties of this recycled plastic are altered (its elasticity, clarity, and strength are diminished), chemical additives may be added to attain the desired quality. As a result, this recycled plastic can actually increase the contamination of the environment. Likewise, because it was not designed with recycling in mind, paper requires extensive bleaching and other chemical processes to make it blank again for reuse. The result is a mixture of chemicals and pulp that are not really appropriate for handling and use. The fibers are shorter and the paper is less smooth than virgin paper, allowing an even higher proportion of paper particles to wear away into the air, where ​they​ can be inhaled and can irritate the nasal passages and lungs.

Q. What is the main idea?