Hello，everyone!Welcome to the Dunhuang Mogao Grottoes．Of course，many people also call it Mogao Caves，which is the nation key cultural relic protection，I am your tour guide，Now，listen to me slowly．

Mogao Grottoes is known as"Thousand﹣Buddha Grottoes，located in 25km southeast of Dunhuang city，Gansu province in western China，a total of five layers from top to bottom，the existing four hundred and ninety﹣two caves，murals of more than forty﹣five thousand square meters，Mogao grottoes murals are always painted on the walls of caves，mainly include the figure of Buddha，Buddhist stories，historic，JingBian，two thousand four hundred and fifteen body painted sculpture，the largest of which is 33meters high，and the minimum of which is only 10centimeters high．statue of flying more than four thousand．The Mogao Grottoes which has a long history，and Yungang Grottoes in Shanxi，Henan Longmen Grottoes are called"Three Grotto Art Treasure"in China．

Mogao Grottoes was originally carved in 366AD，and ended in Yuan dynasty．Constant digging，makes the Mogao Grottoes set the period of the world's largest，most abundant content，the oldest Buddhist art treasure．At the same time，Mogao Grottoes also shows the outstanding wisdom and remarkable achievements of the working people．In 1987，the Mogao Grottoes is listed in the world cultural heritage by UNESCO．

Well，dear visitors，now，the Mogao Grottoes is really beautiful，wish you all a happy journey，to be in a good mood．Please be sure to pay attention to safety and protect our attractions．

In many regions of Ghana, it can take hours to get to the nearest hospital. As a result, many people lose their lives to treatable illnesses. Osei Boateng experienced this personally when he lost his grandmother and aunt. Feeling an urgent call to help, Boateng decided he would make it his life mission to bring health care to remote communities in Ghana.

Boateng started his nonprofit, OKB Hope Foundation 2 years ago, he converted a van (厢式货车) into a mobile doctor’s office and started bringing health care directly to those in need. A few times a week, the mobile clinic and medical team travel long distance to remote communities in Ghana and provide free routine medical care.

On each trip, Boateng’s team consists of a nurse, a physician’s assistant, a doctor, and an operation assistant. In the van, they can run basic labs like bloodwork as well as prescribe and provide medications. “It’s like a one-stop shop for people,” said Boateng, adding that most of the people they see have one health issue or another.

Since its launch, Boateng says the Hope Health Van has served more than 4,000 Ghanaians across more than 45 rural communities who otherwise don’t have easily accessible medical care. Boateng has big plans for the future. He hopes to expand to provide more consistent and high-quality mobile medical care not only to those living in remote areas of Ghana but in other countries as well.

Boateng has gone all in on his OKB Hope Foundation, recently quitting his job to dedicate his time to bringing health care to his home country. But for him, the sacrifices are well worth the reward. “Words cannot describe the feeling that you get providing care for someone who otherwise wouldn’t be alive if your mobile health van wasn’t there.”

A research project called Mineral has created robots that move around in farm fields. The project aims to use computers to help farmers grow more food in ways that are healthy for the environment.

With the number of people on earth getting bigger each year, more food needs to be grown in order to feed everyone. As weather patterns continue to change because of the climate crisis, this task is becoming even more difficult. Some experts say that to feed everyone, more food will need to be grown over the next 50 years than in the last 10,000 years. In the past, farmers tried to quickly increase the amount they produce, using methods that were not always healthy for the environment— more fields, fertilizers, and pesticides。

Instead, the focus of the Mineral project is on getting farms to produce more by improving conditions for each plant. Elliot Grant, who leads the project, says the goal is to “manage the plant instead of the plot.” Mineral’s team spent several years talking to farmers to see what problems they were having and how these problems might be fixed. That led to the creation of special robots, called “plant buggies”.

At first, the buggies were very simple. They were built on bicycles and took pictures with cell phones. Over time, they’ve been improved repeatedly. The plant buggies roll on four wheels and are high enough to glide(滑行) over rows of plants without hurting them. They’re covered in solar panels and have strong wheels, allowing them to roll through muddy fields. The robots can take detailed pictures of plants, track each plant’s location, and measure the plant’s size.

Before, farmers had information about the soil and the weather, but they couldn’t track every plant. Now, with Mineral’s robots, they can. By collecting lots of information like this, Mineral believes computers can help farmers make predictions about how their plants will grow. Studying each individual plant could end up saving time and money. For example, if robots can spot which plants have diseases, farmers can quickly get rid of these plants before they ruin the entire crop, allowing farmers to only fertilize and water the plants that truly need it.