People need to seek out new foods because the world has so many mouths to feed. As of 2015, there are more than seven billion people on Earth, according to the United Nations. And by 2100 that number may double. Feeding all of these people means not only improving the way foods are grown, but also finding new sources of nutrition.

    And that quest is becoming ever more urgent. If nothing changes, within 35 years, the world's appetite will be greater than the amount of foods produced. That's according to a report released last year. It was prepared by the Global Harvest Initiative, a private agriculture group based in Washington, D.C.

    Global warming, too, is changing food production. Scientists predict that rising temperatures will reduce the growth of important crops like wheat, corn and soybeans. Low income developing countries will be hit the hardest. When harvests fall, crops become more expensive. And since those foods are also used to feed animals like cows and pigs，meat prices too, will rise.

    All over the world, researchers are racing against the clock to figure out how best to feed more people in a fast­changing world. And some surprising ideas have begun to come up. Two years ago, scientists introduced the first burger made from meat grown in a lab. The project cost more than $300,000, but it's a start. Other researchers are developing seeds that can survive high temperatures and drought. Still other are finding ways to improve the genes of meat animals so they produce more meat and can stand the heat.

    A gloomy(悲观的) forecast for the planet isn't the only reason to study foods for the future. It's a creative quest that will inspire people who can think in new ways about existing plants and animals—even insects. These researchers have used their talents in ways that even they never would have predicted.

    Do you know how to deal with failure at school? Four steps will help you get the most out of each failure and more on.

    . When you feel bad after failing, talk with your parents or good friends, or any other adult. Then decide to take the duty to improve yourself. Read the teachers' comments on your test carefully.

    Ask yourself what you were trying to do and why you failed.. Maybe you didn't have all the information you needed; maybe you made a mistake or a poor decision. If so, give yourself a pat on the back. Fewer people ever get something right the first time they try it, and often it takes them many times. . Sometimes the failure isn't because of something you did or didn't do; it is someone else's fault. But don't spend time blaming them; instead, move on toward your goals.

    . Review the situation to see what your choices are. There is a different between making a decision and giving up. Deciding to follow a better way is one thing; simply walking away means you really have failed.

    Keep trying again. Successful people are different because they choose their next steps instead of just reacting to feelings. If a goal is still important to you, figure out what to do and go after it again..

A. No pains, no gains

B. Don't give up easily

C. Failure is unavoidable

D. Remove your bad feelings

E. If it isn't, do your best on something else

F. Actually it was because you were very lazy

G. Usually it was because you were trying out a new skill or learning a new subject

    Many people are fond of reading stories behind great inventions. However, new research suggests that the stories  (be) fiction instead of fact.

    The story of Franklin's lightning experiment is(education). Generations of children have been amazed by his bravery and his scientific approach to(look) for the truth, but neither the story nor the details of the experiment are entirely true. Scientists all agree that if Franklin had actually touched the key, he would certainly have died from the electric shock.story is that the apple (fall) on Newton's head and led him  (come) up with his theory of gravity. In fact, more than one account suggests that while Newton was certainly inspired by a falling apple, there is no proof  it hit him on the head.

     (admit), fiction is often more interesting  the truth. People have been more inspired by Franklin's spirit of scientific (explore) than by the facts themselves. But in science, facts should be proved by experiments and research, and we should not always believe everything we read or hear--even if it is a great story.