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    My parents grew up during the Depression(大萧条) attending small country churches. At the close of Christmas Eve services, each child was given a brown paper bag containing an apple, an orange, nuts and several chocolates.

Years later, whenever Dad recalled that tradition, his eyes shone reliving the memory. My mother didn't share his enthusiasm. She always said the chocolates tasted cheap and old.

    Cheap chocolates or not, the paper bags with goodies were an event. Gifts of any sort during the Depression were rare, especially in large farm families with seven children.

    When our children were young and we were home for Christmas one year, Mom and Dad gave each of the grandkids a brown paper bag holding an apple, an orange, nuts and several chocolates. When we finished the 8-hour drive home after the holiday, there was a message waiting on the phone when we walked in the door. “Your ungrateful kids left their apples and oranges in the back of our refrigerator. No more fruit for them!” Grandpa and Grandma were joking, of course, but still there was a degree of disrespect in the kids leaving behind thoughtfully chosen gifts.

    But the paper bag didn't have a context for our children. They had never known fruit to be a scarcity(缺乏). They didn't appreciate the gift because they had never experienced the need the gift was meant to fill.

    The same is true of Christmas today. We don't appreciate the true gift of the season because we don't understand the need the gift was given to fill.

It's not like we don't know we have needs. We know them, all right—patience, love, self-control, strength, courage, faithfulness, forgiveness—it's just that we have become experts at numbing(使麻木) ourselves to our needs.

    The true gift of the season is a perfect fit for our every need. When a gift like apples and oranges fits a need, there is a cheerful satisfaction. When the gift of a Christmas tree fits a need, there is the joy of Christmas.

    If you are human, you can't help but experience times when everything seems to be going wrong and you feel as if your life is completely out of control. It is during those “down times” that words of encouragement from family, friends, co-workers or even strangers can lighten your spirits. It is also during those times that destructive(有害的) words can sink you deeper and deeper into depression(沮丧).

    For example, consider this story about a group of frogs who were traveling through the woods when two of them fell into a deep pit（坑）. All of the other frogs gathered around the pit. When they saw how deep the pit was, they told the two unfortunate frogs they would never get out.

    The two frogs ignored the comments and tried to jump out of the pit. The other frogs kept telling them to stop. Finally, one of the frogs took heed of what the other frogs were saying and simply gave up. He fell down and died. The other frog continued to jump as hard as he could. Once again the crowd of frogs shouted at him to stop the pain. The more they shouted, the harder he jumped and finally he made it to safety.

    When he got out, the other frogs asked him why he continued to jump when they were all shouting at him to simply quit. The frog explained to them that he was a little bit deaf. He thought they were encouraging him the entire time.

    Every time you have a chance to say either something positive or negative to another human being, do choose the chance to say something positive! Don't let those opportunities get away from you. Your words have a large amount of power. Use them wisely. You really never know just how much they can mean to someone else.

    The Summer Science Exhibition（展览）is held every year to celebrate the cutting edge of UK science. With more than twenty exhibits of hands-on science and technology and a series of encouraging talks and activities, there's something for everyone. All of our events are free and no booking is required. School groups should let our organizers know ahead of time. Meet the scientists, discover the exciting research and technology they work on and have fun with great hands-on activities.

Opening hours

    The exhibition will be open from Monday, July 2, to Sunday, July 8, 2018. More detailed opening hours will be published here in May 2018.

    Please wait in line to enter the building and pass through security（安全）, particularly during the weekend. If you are planning to attend a talk, please make sure that you leave enough time.

Food and drink

    Take a break at our café which offers a selection of hot dishes, salads, sandwiches, cakes and some soft drinks on the ground floor.

The café is open throughout the exhibition and closes 30 minutes before closing time each day.

    Wheelchair users please speak to a worker if you would like to buy food from the café.

Contact

    If you have any questions before your visit, please keep in touch with us on 020 7451 2242 or at exhibition@royalsociety.org. For schools or colleges, visit our school and college page, or contact education@royalsociety.org.

    The health of millions could be at risk because supplies of medicinal plants are being used up. These plants are used to make traditional medicine, including drugs to fight cancer. “The loss of medicinal plants is a quiet disaster,” says Sara Oldfield, secretary general of the NGO Botanic Gardens Conservation International.

    Most people worldwide rely on herbal (药草制的) medicines which are got mostly from wild plants. But some 15,000 of the 50,000 medicinal species are under threat of dying out, according to report from the international conservation group Plantlife. Shortages have been reported in China, India, Kenya, Nepal, Tanzania and Uganda.

    Over-harvesting does the most harm, though pollution and competition from invasive species (入侵物种) and habitat destruction all contribute. Businessmen generally harvest medicinal plants, not caring about sustainability (可持续性),” the Plantlife report says, “damage is serious partly because they have no idea about it, but it is mainly because such collection is unorganized”. Medicinal trees at risk include the Himalayan yew (紫衫) and the African cherry, which are used to treat some cancers.

    The solution, says the report's author, Alan Hamilton, is to encourage local people to protect these plants. Ten projects studied by Plantlife in India, Pakistan, China, Nepal, Uganda and Kenya showed this method can succeed. In Uganda, the project has kept a sustainable supply of low-cost cancer treatments, and in China a public-run medicinal plant project has been created for the first time.”

    “Improving health, earning an income and keeping cultural traditions are important in encouraging people to protect medicinal plants,” says Hamilton, “You have to pay attention to what people are interested in.”

Ghillean Prance, the former director of the Royal Botanic Gardens at Kew in London, agrees that medicinal plants are in need of protection. “Not nearly enough is being done,” he told New Scientist. “We are destroying the very plants that are of most use to us.”

Dawn Loggins of Lawndale, N. C. is on her way to Harvard, one of the eight world­famous universities in the eastern US. Nobody encouraged her to study or paid for her special classes. This girl created her own future.

The teen was abandoned by her family last summer, when her parents and two sisters moved to Tennessee. She found herself homeless and had to spend the night on friend's sofas.

The school bus driver learned about Dawn's situation and invited Dawn to move in with her family. Soon, Dawn had a job at Burns High School. She worked from 6 a. m. to 7：40 a. m. before the first school bell rang. She swept floors and picked up trash again in the afternoons, before diving into her studies in the evenings.

Dawn's hard work paid off. She finished school with a 3. 9 GPA and scored 2, 110 on the SAT.

"There were times when I felt like it would be easiest if I gave up," the 18­year­old said." But it was never in me to give up, because I realized that I was never going to be successful unless I got an education."

Even before Dawn's family left her, she led a difficult life. Her family was poor and cups of noodles were often the only food. Dawn" studied by candlelight" because her parents couldn't afford to pay the electricity bill(电费).

Dawn has now reconnected with her family. They are proud of her accomplishments(成就)and are attending her high school graduation.