Today, air travel is far safer than driving a car on a busy motor-way. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in midair, 600 lives could be lost.

From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down.

The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided(避免) each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

When bicycle-sharing company oBike pulled out of Singapore abruptly last year, it left the city with unattended bicycles everywhere. Myanmar businessman Mike Than Tun Win saw the perfect opportunity to turn trash (垃圾) into treasure. “What if these bicycles could be distributed to poor students in villages so they can cycle to school?” he thought.

Mr Than, 33, grew up in Mandalay, where he used to walk to school as a student. While traveling through rural (乡村的) areas in Myanmar over the last few years he saw things had not changed. Long lines of children in rural villages continue to walk 30 minutes to an hour just to get to school. “I thought if we could just reduce the time they take, they could spend more time studying, gain more knowledge and increase their chances of getting out of poverty (贫困),” he said.

With that, he started a movement called Lesswalk with the intention of buying bicycles from bike-sharing firms oBike and ofo-which have stopped operations in Singapore — and shipping them to Yangon. He would renew the bicycles before distributing them to teenagers and families living in rural villages in Myanmar, beginning with villages in Mandalay and Sagaing areas.

Over the last three months, the businessman has bought 10,000 bicycles in Singapore and Malaysia. He paid for 5,000 of the bicycles out of his own pocket, with other sponsors paying for the rest.

Mr Than plans to modify (修改) the bicycles so that they can better suit the needs of the children in villages, most of the time they ride around with their little brothers and sisters. I’m planning to add an extra seat at the back so that they can go to school together,” he said. He also plans to remove the digital locks and give each a new one that works better in villages.

Including the cost of shipping, modification and distribution, Mr Than thinks each bicycle might cost him around US $35 to US $40. “I might have to spend more money, but it is better that these bicycles are going to help some people rather than going to waste,” he said.

Linking the royal wonders of Beijing with the dreamlike palaces of Lhasa, the Z21 train travels from the modernity of urban China to a once-remote land. Running westward, the train climbs nearly 16,400 ft (5,000 m) on its journey to the roof of the world: the Tibetan Plateau.

This overnight train journey is filled with the romance of rail travel. It’s just a pity that the whole experience—from dining-car chatting and light beer, to being carried into a la-la land by the rhythm of the rails and waking to bedside views of towering peaks—feels like it’s over in a flash. Though it may be short, the Caledonian is surely Britain’s best train ride.

Few trains offer the chance of spotting big game from your seat, but the Tazara Railway does exactly that. For many, the highlight is neither the scenery nor the wildlife, though; it’s the chance to spend two days watching everyday life out of the window, and enjoying the crowds and chaos when the train pulls to a stop.

Traveling across the Altiplano, from the shores of Lake Titicaca to the beating heart of the Inca capital, the railway from Puno to Cuzco cuts a picturesque path through the snow-dusted peaks and fantastic valleys of the Andes. Passengers can enjoy the landscape from an open-air observatory car, as they travel through remote towns and villages.