QUES: Chemical changes produce new substances. For this reason, they often cannot be undone. Some chemical changes can be reversed, sort of. To do so requires another chemical change to take place. For example, you can undo the tarnish on copper pennies by placing them in vinegar. The acid in the vinegar reacts with the tarnish. This is a chemical change that makes the pennies bright and shiny again. You can try this yourself at home to see how well it works. Other chemical changes cannot be reversed at all or may be difficult to do. Rusting is a chemical change. If metal rusts, the best you can do is to sand off the rust to get down to the shiny metal. Although the metal may now be shiny, the rust was removed. The rust was not changed back into the original metal. Some chemical reactions occur in only one direction. These reactions are called irreversible reactions. For example, you cannot change a fried egg back into a raw egg. Can you think of some other irreversible reactions related to cooking? Would you like a piece of cake?
Do you have any questions?
MY QUESTION: What can you do to make pennies bright and shiny again?

QUES: You write: "Having created the desired impression, Moore follows with his Heston interview." No, he doesn't. You accuse Moore so often of changing the chronology, yet you have no problems changing it yourself. The Heston interview is at the very end of the movie. After the Flint rally comes a brief TV interview with Heston, where he is asked about Kayla Rolland (again, clear evidence that the local media in Flint raised questions about the NRA's presence), then an inteview with country prosecutor Arthur Busch, entirely ignored by critics of the film, who also mentions Heston's presence as notable, and refers to the immediate reactions of "people from all over America", gun owners/groups who, according to him, reacted aggressively to warnings of having guns accessible to children, much like spanking advocates react aggressively when anti-spankers point to a case of a child being killed or severely injured by a beating. These people do not feel the need to express sympathy, or to think about ways to avoid such incidents, but they feel the need to assert their "rights" and to look for quick, simple answers -- as Busch states, gun owners wanted to "hang [the child] from the highest tree". This is all not mentioned by critics of Moore's movie, who claim to be objective. Perhaps the best example of the paranoia surrounding Moore's film is your sub-essay "Is the end of the Heston interview itself faked?" Moore answers a simple question -- how could the scene have been filmed -- with a simple answer: two cameras. From this, you construct an obscure conspiracy of "re-enactment": "For all we can tell, Moore could have shouted 'Hey!' to make Heston turn around and then remained silent as Heston left." Even if your "re-enactment" theory is true (and I see no evidence that you have actually tried to ask the people involved in the filmmaking for their opinion), this itself is not unethical, and you have no evidence whatsoever that Moore has done anything unethical here, just like you have no evidence that Moore has unethically removed parts of the interview. You use standard filmmaking technique as a basis to construct bizarre conspiracies which sound plausible to the gullible reader, without ever providing any evidence for the implicit or explicit claims of fraud and distortion.
Do you have any questions?
MY QUESTION: Which standard filmmaking technique is used as a basis to construct conspiracies?

QUES: Josie started planning her new garden in the winter. She chose flowers and vegetables that could grow in her area. She looked through the seed magazines. She ordered the tastiest kind of each vegetable and the prettiest kind of each flower. She talked to a friend about her plans. It seemed like the snow would never melt. But Josie didn't have to wait for spring to get started. Six weeks before the last frost, Josie planted seeds indoors. The tiny seedlings pushed up through the soil and began to grow. Finally spring arrived. Each day, Josie moved the seedlings outside for a few hours so they could get used to the cooler temperatures. Josie worked in her garden, digging the soil. She added a special growing mix from the garden store to make the soil better. When everything was ready, she removed the seedlings from their trays and planted them in her garden. The warm sun and rich soil helped her vegetables and flowers grow.
Do you have any questions?
MY QUESTION: What kinds of things did Josie want to plant?

QUES: Hundreds of thousands of years before China was to become the world's longest-running civilization, the prologue was enacted by means of the flicker of a carefully tended fire. Peking Man, a forebear of Homo sapiens, achieved a mastery of fire. We might call it the first Chinese invention. Not that he devised flint and steel, matches, or any other way of creating fire. Peking Man simply learned how to capture flame, perhaps from a forest fire, and keep it alight. He thus enjoyed two revolutionary luxuries: light and heat. Technologically and sociologically, it was a phenomenal breakthrough: with fire, communities could live year 'round in one cave, in which cooking and even smelting could be pursued. And so, by 600,000 b.c., about 50 km (31 miles) southwest of present-day Beijing, the ancestors of mankind were ready to settle down. Several hundred thousand years later, when Marco Polo reached the capital of China, he was astonished by a further development in fire technology. The Chinese, he announced, used black stones dug out of mountains as fuel. Europeans did not yet have a word for "coal," nor had they discovered a use for it. The First Dynasty The confluence of mythology and history in China took place around 4,000 years ago during what is referred to as the Xia (Hsia) Dynasty. This was still the Stone Age, but the people are thought to have made silk from thread produced by the worms they cultivated on the leaves of their mulberry trees. And written language (which evolved as early as 4,500 to 5,000 years ago) was already in use, originally by oracles and then by official scribesChina's first scholars. During the second of the quasi-legendary dynasties, the Shang (from about the 16th to 11th centuries b.c.), the Chinese developed an interest in art. Careful geometric designs as well as dragon and bird motifs adorned bowls and implements. And with the arrival of the Bronze Age, the Chinese created bronze vessels of such beauty and originality that, until modern times, archaeologists refused to believe they were cast 3,000 years ago. The Shang Dynasty gave rise to the concept of one Chinese nation under one government.
Do you have any questions?
MY QUESTION:
Who was the mastery of fire?