—Sorry I have been in a race and my strength has completely __________.

Earthquake rescue robots have experienced their final tests in Beijing. Their designers say with these robots, rescuers will be able to buy more time to save lives during an earthquake.

This robot, looking like a helicopter, is called the detector (探测器) bot. At about 4 metres long, it took about 4 years to develop the model. Its main functions are to collect information from the air, and deliver goods of up to 30 kilos to people trapped by an earthquake.

This robot is equipped with a high 360­degree panoramic (全景的) camera. It can work day and night and also be able to send the latest pictures from the quake area.

Dr Qi Juntong, from Chinese Academy of Sciences, said, "The most important feature of this robot is that it doesn't need distant control. We just set the information on it, and then it takes off, and lands by itself. It flies as high as 3,000 metres, and as fast as 100 kilometres per hour."

This robot has a different function — it can change as the environment changes. Its main job is to search for any signs of life in places where human rescuers can't go.

The robot is equipped with a camera that can work in the dark, as well as a detector that not only finds people, but can also detect poisonous gas.

Another use for the rescuers is the supply bot, with its 10­metre­long pipe. People trapped in the ruins will be able to get supplies including oxygen and liquids.

Experts have said that the robots will be produced, and serve as part of the national earthquake rescue team as soon as next year.

A walker seriously injured in a mountain­top lightning strike which killed two others is showing signs of improvement, the police have said. A major rescue operation was performed on Sunday following two strikes which hit the Brecon Beacons, South Wales. Two men died, while two others were taken to hospital.

A police spokeswoman said, “A man in a serious condition in hospital, following simultaneous (同时发生的) incidents in the Brecon Beacons, has now improved and he is recovering. Officers are continuing to get in touch with the next of relatives of the dead men and enquiries are ongoing. All men were believed to be from England.”

Mark Jones, of the Brecon Mountain Rescue Team, described the lightning strike as a freak accident, and something he had not been called out to in 30 years of service.

The walking group Ramblers Cymru said that while incidents involving thunder and lightning were rare, electrical storms should be taken seriously by walkers.

The organisation's delivery officer, Elly Hannigan Popp, said, "We'd advise everyone to check the weather forecast before starting a walk. If you hear thunder, see lightning or if your hair stands on end, postpone activities even if the sky looks blue and clear. Lightning will strike as far as 10 miles away from any rainfall. Lightning can strike the same place repeatedly — especially tall, pointed, isolated objects."

"If there is no shelter you should keep moving. And if you become the tallest object, crouch (蹲) in the open twice as far away from the nearest pointed object as it is tall. Make yourself as small as possible, stay on your toes and keep your heels together, as it will allow electricity to go up one foot, through the heels and back into the ground through the other."

Panama City, Panama

For beach vacations that get you out of town and invite you and your family to dive into culture, consider a trip to Panama City. Here, you will enjoy beaches and city exploring. Book your stay at the Westin Playa Bonita, where you can book a room starting at $222 a night. There are various programs, including beach Olympics, stargazing (天体观察) and Spanish lessons.

Jupiter, Florida

This place offers you quality time you can spend with your loved ones. Book your stay at Jupiter Beach Resort & Spa, with rates for a family of four starting at $207 a night. Here, you can shoot baskets at the basketball courts, take a dip in the pool or teach your children beach yoga.

San Diego, California

The West Coast is a great spot for cheap beach vacations, so tell your family to pack their bags for a visit to San Diego. A cheap $10 Uber ride from the airport will have you pull up at the Kona Kai Resort & Spa. Here, a family of four can stay in a Deluxe Guest Room starting at $159 per night. Your kids can practice cannonballs at the pool after a visit to the world­famous San Diego Zoo.

Kihei, Hawaii

For west coasters who are growing bored with their background, fly to the islands of Hawaii. Stay at the Aston at the Maui Banyan, with a charge of $179 a night for a family of four. Here, you'll witness some of the best sunsets of your life while your kids play in the Pacific. And if you set about cooking a fancy meal, you'll enjoy suites that come with a full kitchen.

Do you think you have what it takes to be a successful scientist? A successful scientist is generally a good observer. He makes full 1 of the facts he observes. He doesn't accept ideas which are not 2 on obvious facts, and therefore 3 to accept authority as the only truth. He always checks ideas 4 and makes experiments to prove them.

The rise of modern science may perhaps be considered to 5 as far back as the time of Roger Bacon, the wonderful philosopher of Oxford, who lived between the years 1214 and 1292. He was probably the first in the Middle Ages to 6 that we should learn science 7 observing and experimenting on the things around us, and he himself 8 many important truths.

Galileo (1564－1642), 9 ，who lived more than 300 years later, was the greatest of several great men in Italy, France, Germany, and England, who began to show how many important 10 could be discovered by observation by degrees. Before Galileo, learned men believed that large bodies 11 more rapidly towards the earth than small ones, 12 Aristotle said so. But Galileo, going to the 13 of the Leaning Tower of Pisa, let fall two 14 stones and proved Aristotle was wrong. It is Galileo's 15 of going direct to nature, and proving our 16 and theories by experiment, that has 17 all the discoveries of modern science.

What 18 those people good scientists? From the example of Galileo, we know clearly that 19 scientists are those whose observations have 20 better results.