Researchers at China Aerospace Science and Industry Corp, a State-owned defense contractor, have developed and made the world’s first robot whale shark（鲸鲨）.

The robotic shark has been on display in an aquarium（水族馆）at Shanghai Haichang Ocean Park since January.

A whale shark is a slow-moving carpet shark and the largest known living fish.

Designed and built by engineers at the Shenyang-based No 111 Factory, the underwater robot is 4.7 meters long, weighs 350 kilograms and can move 42 meters a minute.

Powered by a lithium battery, it can swim, turn, float and dive like a real shark by moving its mechanical fins（鳍）. The mouth and gills（鳃）can also open and close like a shark’s. The biomimetic shark is made of sensors（传感器）, multi-joint fins, batteries, and systems which enable it to avoid what’s in the way in all directions.

“The robot can reach a depth of 10 meters and work for as long as 10 hours,” said Fang Xuelin, a senior researcher in charge of the robot shark program.

“The shark can be remotely controlled and can also swim based on preset programs or its own sensors,” he said.

“We have built multiple kinds of robot fishes, and the robotic whale shark is the largest mechanical fish we have made so far,” Fang added. “Our robots are to serve three purposes—to perform in aquariums for entertainment, spread knowledge about the sea and aquatic（水生的）animals among youngsters, and carry out scientific tasks such as hydrological surveys, underwater photography and environmental inspection.”

“The factory now plans to develop more types of aquatic robots, including some extinct mammals（哺乳动物）, for display in parks and schools. It will also promote the products to businesses engaged in fields such as underwater salvage and mineral prospecting,” he said.

Scientists have used clever methods to discover a hidden hallway inside the Great Pyramid of Giza in Egypt. The 9-meter-long hallway could lead to new discoveries about the pyramid.

The Great Pyramid of Giza is the largest of three pyramids near Giza, Egypt. It was built about 4,500 years ago by a king named Khufu. The pyramid was built as a place for Khufu to be buried (安葬).

The pyramid was sealed (密封的) until AD 820, when someone broke it open on one side. This person found three rooms, one on top of the other, inside the pyramid. The largest room was the King’s Chamber. Below that was the Queen’s Chamber. There was another room underground.

The pyramid has a long, angled hallway, called the Grand Gallery. The Grand Gallery leads to the King’s Chamber. There are also other hallways that go up and down, and a tunnel that now serves as an entrance for tourists.

But most of the pyramid has been sealed since it was built. The pyramid is believed to hold many other secrets. But scientists don’t want to damage the pyramid by opening it up to learn those secrets.

Instead, since 2015, a group of scientists from around the world have been using invisible rays (不可见射线) to scan the inside of the pyramid. They call their group “ScanPyramids”.

Now the ScanPyramids group has shown that there is also a hidden hallway not far from the tourist’s entrance to the pyramid.*

It’s still not clear what the hallway and the large empty space were for. The scientists believe they may have been used to help spread out the weight of the pyramid.

The scientists plan to continue scanning the pyramid—and others, too—in the hopes of learning more.

Smart Planet

Smart planet brings together the best plant that will be comfortable in the Southern California gardens, using much less water than traditional garden plants. You will also enjoy beautiful flowers and foliage(绿叶).

Smart Planes

Smart airplanes will appear in the near future. Airbus, one of the world’s biggest airplane makers, is working on new planes that use 5G. With 5G, passengers will be able to use 5G net-work in the air to connect to the Internet and order food and drinks. The new planes are expected to be rolled out(推出) in 2021.

Brilliant Control

It’s a an in-wall lighting and control system that makes it easy for homeowners, families, guests to control many kinds of devices around your home. The price is a little high and it needs some electrical knowledge to set up. But it is difficult. However, with it, you can control lights, temperature, and even play music or see who’s at your front door.

5G Classroom

With the help of 5G, students who take online courses can get better effect of sound and pictures. It will take less time. Especially some people live in poor areas where there are no school. Students will be able to see places of interest without leaving their classroom.