Can a small group of drones（无人机）guarantee the safety and reliability of railways and, at the same time, help railway operators save billions of euros each year? That is the very likely future of applying today's "eyes in the sky" technology to making sure that the millions of kilometres of rail tracks and infrastructure（基础设施）worldwide are safe for trains on a 24/7 basis.

Drones are already being used to examine high-tension electrical lines. They could do precisely the same thing to inspect railway lines and other vital aspects of rail infrastructure such as the correct position of railway tracks and switching points. The more regularly they can be inspected, the more railway safety, reliability and on-time performance will be improved. Costs would be cut and operations would be more efficient（高效）across the board.

That includes huge savings in maintenance costs and better protection of railway personnel safety. It is calculated that European railways alone spend approximately 20 billion euros a year on maintenance, including sending maintenance staff, often at night, to inspect and repair the rail infrastructure. That can be dangerous work that could be avoided with drones assisting the crews' efforts.

By using the latest technologies, drones could also start providing higher-value services for railways, detecting faults in the rail or switches, before they can cause any safety problems. To perform these tasks, drones for rail don't need to be flying overhead. Engineers are now working on a new concept: the rail drones of the future. They will be moving on the track ahead of the train, and programmed to run autonomously. Very small drones with advanced sensors and AI and travelling ahead of the train could guide it like a co-pilot. With their ability to see ahead, they could signal any problem, so that fast-moving trains would be able to react in time.

Popularization has in some cases changed the original meaning of emotional intelligence. Many people now misunderstand emotional intelligence as almost everything desirable in a person's makeup that cannot be measured by an IQ test, such as character, motivation, confidence, mental stability, optimism and “people skills.” Research has shown that emotional skills may contribute to some of these qualities, but most of them move far beyond skill-based emotional intelligence.

We prefer to describe emotional intelligence as a specific set of skills that can be used for either good or bad purposes. The ability to accurately understand how others are feeling may be used by a doctor to find how best to help her patients, while a cheater might use it to control potential victims. Being emotionally intelligent does not necessarily make one a moral person.

Although popular beliefs regarding emotional intelligence run far ahead of what research can reasonably support, the overall effects of the publicity have been more beneficial than harmful. The most positive aspect of this popularization is a new and much needed emphasis on emotion by employers, educators and others interested in promoting social well-being. The popularization of emotional intelligence has helped both the public and researchers re-evaluate the functionality of emotions and how they serve people adaptively in everyday life.

Although the continuing popular appeal of emotional intelligence is desirable, we hope that such attention will excite a greater interest in the scientific and scholarly study of emotion. It is our hope that in coming decades, advances in science will offer new perspectives ( 视角) from which to study how people manage their lives. Emotional intelligence, with its focus on both head and heart, may serve to point us in the right direction.

About five weeks ago, I noticed the skin of our pet lizard was growing dusty. It worried me. I reported the strange surface on the skin of the lizard to my husband and children the next morning. Seconds later, our lizard emerged from its tank with its old skin flowing behind it.

I didn't think about it much until a morning last week when I knocked my favorite teapot off the table. It burst into hundreds of pieces. As I swept up the mess, I wondered why we had been breaking so many things over the months.

The destruction started three months ago. It was my husband's birthday. He had just lost his job. The uncertainty was starting to wear on us, so I wanted to do something special.

"Let's make a cake for Dad" I cried.

My kids screamed with joy. We baked, iced and sprinkled for most of the day. Candles on the cake! Balloons on the walls! Flowers on the table!

Two hours before my husband came back home from another job interview, my daughter climbed up to grab a glass vase from a high shelf. It fell and crashed beside the cake. Tiny pieces of glass were everywhere. She sobbed loudly as I threw the cake away. My husband had banana pudding for his birthday.

Three days ago, the light in our living room suddenly went out. After several frustrating hours of unsuccessful attempts to fix it, my husband suggested watching the Michael Jordan documentary series The Last Dance.

The poignancy of Jordan retiring from his beloved basketball to play baseball and what had pushed him to make such a tough decision took me by surprise. As I watched him take off his basketball uniform and replace it with a baseball uniform, I saw him leaving behind the layer that no longer served him, just as our lizard had. Neither of them chose the moment that had transformed them. But they had to live with who they were after everything was different. Just like us. I realized that we have to learn to leave the past behind.

Humans do not shed skin as easily as other animals. The beginning of change is upsetting. The process is tiring. Damage changes us before we are ready. I see our lizard, raw and nearly new.

Jordan said that no matter how it ends, it starts with hope. With our tender, hopeful skin, that is where we begin.