It's summer movie time again. And heroes are ready to try their strength and magic on the silver screen. Check out our list of four films that look most promising to young audience.

    Harry potter and the Prisoner of Azkaban

    Release Date:  June 4

    Story: It's the summer before Harry Potter's third year at Hogwarts School of Witchcraft and Wizardry. A shadow is hanging over Hogwarts. A dangerous murderer, Sirius Black, has escaped the Wizards' Prison. And he broke out to fulfill one task to kill Harry Potter.

    Around the World in 80 Days

    Release Date:  June 16

    Story: This version of the classic novel set in 1872 focuses on Passepartout (Hong Kong actor Jackie Chan), a Chinese thief who seeks refuge with a strange London adventurer, Phileas Fogg. Passepartout uses his martial arts skills to defend Fogg from danger as he travels around the world in 80 days to win a bet.

    Spider- Man 2

    Release Date: June 30

    Story :Peter Parker is still coming to terms with his dual  identity (双重身份)as the crime superhero Spider-Man. He wants to reveal his secret identity to Mary Jane: meanwhile, his aunt May has fallen on hard times. A new bad man, Dr Otto Octavius, has appeared to cause more troubles.

    King Arther

    Release Date: July 7

    Story: King Arthur is presented as a clever ruler who manages to unite all the knights(骑士) in Britain after the fall of the Roman Empire(帝国). Under the guidance of Merlin and the beautiful, brave Guinevere, Arthur will struggle to realize his dreams

    It was dawn of March 21, 2018. Gary Messina was on his morning run along New York City'8East River. Suddenly something caught his eye—a large 60-year-old man balancing on the four-foot-high fence that guarded the path from the water. As Messina got closer to the scene, the man took a step forward and slipped into the dark river below.

    When Messina reached nearer, the man was struggling in the water, clearly unable to swim. Other joggers also heard the man's cry. David Blauzvern and John Green dropped their phones and keys on land and jumped in. “ People had called the police, but it was unclear when they'd get there,” says Green. “We just reacted. Messina joined them in the river. Just as the jumper was losing strength, Blauzvern take hold of him. The pair were about 30 yards from the seawall when Messina and Green caught up to them. They seized the man, with Blauzvern supporting his back and Messina and Green holding him up from either side. As the men made their way toward the concrete seawall that stretched for blocks in each direction, Blauzvern had an awful realization:there was no way out of the river.

    By now, a crowd had gathered on land. “A rescue boat is on its way, someone yelled to them. Swimming forward was getting tougher by the minute. The jumper, who was six foot two and weighed around 260 pounds, was heavy in his rescuers' arms. After ten minutes, they managed to get to the river's edge. “I've never been so out of breath, ”says Blauzvern.

    Fifteen minutes after the men had jumped into the river, the two-man rescue boat appeared. But because it couldn't risk getting too close to the seawall, the men had to swim out to it. “I was completely out of energy at this point, “says Blauzver. The men in the water pushed the jumper while the men in the boat pulled him up and, finally, to safety. The man they had saved was taken to the hospital for evaluation(评估). Details on his condition have not been released. As for the rescuers, each of them was at work by 10:30a. m. “I was a bit late,” admits Blauzvern, smiling. “But I had a good excuse.”

    The BeiDou Navigation Satellite System（BDS）is a Chinese satellite navigation system. It consists of two separate satellite constellations（星座）. The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System and also known as BeiDou-1, consists of three satellites, which since 2000 has offered limited coverage and navigation services, mainly for users in China and neighboring regions. Beidou-1 was decommissioned at the end of 2012.

    The second generation of the system, known as COMPASS or BeiDou-2, became operational in China in December 2011 with a partial constellation of 10 satellites in orbit. Since December 2012, it has been offering services to customers in the Asia-Pacific region.

    In 2015, China started the build-up of the third generation BeiDou system（BeiDou-3）in the global coverage constellation. The first BDS-3 satellite was launched on 30 March 2015. Up to January 2018, nine BeiDou-3 satellites have been launched. BeiDou-3 will eventually consist of 35 satellites and is expected to provide global services upon completion in 2020. So far, China has sent 27 BeiDou satellites into space. When fully completed, BeiDou, the world's fourth navigation satellite system, following GPS in the United States, GLONASS in Russia and Galileo in the European Union, will provide an alternative global navigation satellite system to the United States owned Global Positioning System（GPS）, and is expected to be more accurate than the GPS. It was claimed in 2016 that BeiDou-3 will reach millimeter-level accuracy（with post-processing）, which is ten times more accurate than the finest level of GPS.

    According to China Daily, in 2015, fifteen years after the satellite system was launched, it was generating a turnover of $31.5 billion annually for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp.

    Reading may be fundamental, but how the brain gives meaning to letters on a page has been a mystery. Two new studies fill in some details on how the brains of efficient readers handle words. One of the studies, published in the April 30 Neuron, suggests that a visual-processing area of the brain recognizes common words as whole units. Another study, published online April 27 in PLOSONE, makes it known that the brain operates two fast parallel systems for reading, linking visual recognition of words to speech.

    Maximilian Riesenhuber, a neuroscientist at Georgetown University in Washington, D.C., wanted to know whether the brain reads words letter by letter or recognizes words as whole objects. He and his colleagues showed sets of real words or nonsense(无意义的词语)words to volunteers undergoing fMRI scans. The words differed in only one letter, such as “farm” and “form” or “soat” and “poat”, or were completely different, such as “farm” and “coat” or “poat” and “hime”. The researchers were particularly interested in what happens in the visual word form area, or VWFA, an area on the left side of the brain just behind the ear that is involved in recognizing words.

    Riesenhuber and his colleagues found that neurons(神经元)in the VWFA respond strongly to changes in real words. Changing “farm” to “form”, for example, produced as great a change in activity as changing “farm” to” coat”, the team reports in Neuron. The area responded slowly to single-letter changes in made-up words.

    The data suggests that readers grasp real words as whole objects, rather than focusing on letters or letter combinations. And as a reader's exposure to a word increases, the brain comes to recognize the shape of the word. Meaning is passed on after recognition in the brain, Riesenhuber says.

    The researchers don't yet know how longer and less familiar words are recognized, or if the brain can be trained to recognize nonsense words as a unit.

    Their beautiful call suggests the arrival of spring, but the routes taken by cuckoos(杜鹃) during their annual migration(迁徙) have remained a mystery. Now, though, scientists from the British Trust for Omithology(BTO) have revealed the details of their remarkable 10,000-mile journey, with the help of tracking devices.

    Five male birds were caught in Norfolk last May and fitted with satellite-tagged "backpacks" before being released. The scientists then monitored their progress over 12 months as they flew to Africa in the autumn, and returned in the spring.

    The project was carried out to discover why every year fewer of the birds return to Britain. Between 1995 and 2010，the population of cuckoos spending summer here fell by almost half, and the number is continuing to decline. Previously, the lack of information about the cuckoos' long migration has hampered the understanding of how to help conserve the birds.

    Earlier this year, it was reported that cuckoos arrived in the UK much earlier than normal. Their call was recorded by ornithologists(鸟类专家) as early as February, a month ahead of their usual arrival.

    Like all migrating animals, cuckoos respond to the changing seasons. They depend on lush plants to provide the fruit and food for insects that they feed on. This reliance on seasonal patterns means that a changing climate could make an already challenging journey impossible for them.

    A study of 27, 000 men showed those skipping (不吃) breakfast were at a greater risk of heart problems. The British Heart Foundation said breakfast helped people resist (抵制) sugary snacks before lunch.

    The men, aged 45-82, were studied for 16 years. During that time there were more than 1, 500 heart attacks or cases of deadly heart failure. However, people who skipped breakfast were 27% more likely to have heart problems than those who started the day with a meal. The researchers took into consideration other lifestyle risk factors (因素) such as smoking and exercise.

    Researcher Dr. Leah Cahill told the BBC: "The take-home message is to eat in the morning when you wake up, preferably within an hour. The results show that something is better than nothing, but it's always better to have something healthy and balanced."

    She said the timing of the meal seemed to be key and waiting until lunch rather than "having breakfast" may be straining (损伤) the body over time. This could be increasing the risk of high blood pressure and fatness which could in turn damage the heart. "Don't skip breakfast," Dr. Cahill suggested.

    Victoria Taylor, an expert with the British Heart Foundation, said: "These researchers only looked at men aged over 45, so we would need to see further research to prove that breakfast has the same effect on the heart health of other groups of people. What we do know is that a healthy breakfast can make that mid-morning biscuit less tempting, as well as giving you another opportunity to widen the variety of foods in your diet. Cereals (谷类食品) with low fat milk are a good way to start the day. Try a banana or dried fruit on top and you'll be on your way to a fine day before you've even left the house."