Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays（光线）left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some cases the light from one of tonight's stars started on its journey to you before you were born.

    Thus, if we want to be honest, we cannot say “The stars are shinning tonight.” We have to say, “The stars look pretty. They were shining four years ago but their light has only just reached Earth.”

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    Scientists in Britain have managed to teach bumblebees(大黄蜂) to pull strings to get to food and then pass on what they have learned to others in their colony(群体)—showing a high level of intelligence despite their tiny brains.

    Researchers at Queen Mary University of London said the experiments, often used to test the intelligence of apes (猿) and birds, showed for the first time that some insects are up to the task, and can also pass skills on through several generations.

    The findings add to the evidence suggesting the ability for “culture spread” — the ability to learn and pass on knowledge and skills — may not be exclusive to humans.

    In the research, published in the journal PLOS Biology on Tuesday, the scientists were able to train 23 out of a group of 40 bees to pull strings with their legs and feet.

    The strings were attached to discs — or artificial “flowers” — containing food at their center but placed under a transparent screen. The bees, spotting the food beneath the screen, learned to pull the “flowers” out by pulling the string with their legs and feet to be able to get to it.

    From another group of bees given the chance to solve the task without any training, only two of 110 were successful.

    Another group of bees was then allowed to observe the trained bees pulling the strings, and 60 percent of them successfully learned the skill. Finally, trained bees were put in colonies, and the scientists found the technique spread successfully to a majority of the colony's worker bees.

    Lars Chittka, a Queen Mary University professor who guided the project, said the team is interested in figuring out the brain processes behind the bees' learning and teaching skills.

    Welcome to your handy pricing guide

    This leaflet gives you the prices for Royal Mails UK and International services and Parcelforce Worldwide UK services — whether your item is to the UK or abroad, urgent or you simply want a standard service. To obey national and international regulations governing the carriage of mail, and ensure that mail in transport does not present a danger to the general public, we restrict or ban certain items from our network.

    If you want to find out more about our parcel and letter services, please take a look at the 'our services' booklet for more detailed information. Alternatively, you can find out more by visiting www.royalmail.com or by calling Customer Services on 03457740740. If you are deaf or hearing impaired, we offer a Textphone service on 03456000606.

Dear Miss Hanff,

    You will be glad to know that the two boxes of eggs and the tins of tongue have all arrived safely and once again we all wish to thank you most sincerely for your extreme generosity. Mr. Martin, one of the older members of our staff, has been on the sick list for some time and we therefore let him have the lion's share of the eggs, one whole boxful in fact, and of course he was delighted to get them. The tins of tongue look very inviting and will be a welcome addition to our larders (食物橱) and in my case will be put on one side for a special occasion.

    I enquired at all the local music shops but was unable to get the Messiah or Bach's St. Matthew Passion in stiff covers in clean, secondhand copies, and then I found they were available from the publisher in new editions. Their prices seemed a bit high, but I thought I had better get them and they have been sent by Book Post a few days ago, so should arrive any day now. Our invoice, total $4.20, is enclosed with the books.

    We are sending you a little gift for Christmas. We do hope you will not have to pay any duty on it. We will mark it "Christmas Gift" and keep our fingers crossed. Anyway, we hope you will like it and accept it with our sincere best wishes for Christmas and the coming year.

    My name is certainly not of Welsh origin. As it is pronounced to rhyme with the French word "Noel", I think there may be a possibility that it originated in France.

Yours sincerely,

Frank Doel

Adults check their phones, on average,360 times a day, and spend almost three hours a day on their devices in total. The problem for many of us is that one quick phone-related task leads to a quick check of our emails or social media feeds, and suddenly we've been sucked into endless scrolling.

It's an awful circle. The more useful our phones become, the more we use them. The more we use them, the more we lay neural（神经的） pathways in our brains that lead to pick up our phones for whatever task is at hand-and the more we feel an urge to check our phones even when we don't have to.

What we do know is that the simple distraction of checking a phone or seeing a notification（通知）can have negative consequences. This isn't very surprising; we know that, in general, multitasking does harm to memory and performance. One of the most dangerous examples is phone use while driving. One study found that merely speaking on the phone, not texting, was enough to make drivers slower to react on the road. It's true for everyday tasks that are less high-risk, too. Simply hearing a notification "ding" made participants of another study perform far worse on a task-almost as badly as participants who were speaking or texting on the phone during the task.

It isn't just the use of a phone that has consequences-its me re presence can affect the way we think.

In one recent study, for example, researchers asked participants to either put their phones next to them so they were visible（like on a desk）, nearby and out of sight（like in a bag or pocket）, or in another room. They were found to perform far better when their phones were in another room instead of nearby-whether visible, powered on or not.

Cruz Genet,11, and Anthony Skopick, 10, couldn't agree. Were the birds out on the ice ducks or geese? So on a 1 January evening last year, the two friends ventured onto the 2 pond near their homes, to get a better look. First they tossed a rock onto the ice to3 it. Then they stepped on it. 4 the ice would hold their weight, Anthony took a few steps, then…FOOMP. He crashed through the 5 frozen surface." There was no sound, no crack," he recalled,"I just fell through instantly". Cruz 6 to help his panicked friend. FOOMP— the pond 7 him too.

 The boys were up to their necks in icy water and quickly losing feeling in their limbs. Any chance of their 8 themselves was slipping away. Cruz was sure he was going to die. Anthony's older sister was nearby and started screaming for help.

 John Lavin, a9 driving nearby on his way home, heard her. He quickly 10 . Seeing the boys, he grabbed a nearby buoy (救生圈), 11 off his shoes, and ran into the cold water, chopping(劈) his way through the ice with his free 12 .

 Lavin made his way to Cruz and Anthony and pulled them back to land. When in hospital, doctors discovered that their five- minute 13 in the water had lowered their body 14 nearly ten degrees.

 Fortunately, the boys have fully recovered, though they are still a little awestruck by their 15 neighbor." Just to think," says Cruz," If he weren't there, we could have died."