2 . Scientists have developed a new type of smart bandage (绷带) that can signal the type of bacterial (细菌的) infection it’s protecting, just like a traffic light, as well as release the right type of drugs on demand. The traffic light system works just like this: Green means no bacteria or a low concentration of bacteria, yellow means drug-sensitive (DS) bacteria responsive to standard antibiotics (抗生素) and causes antibiotic release, and red means drug-resistant (DR) bacteria that need extra help to be wiped out.

In testing the bandage on mice, the research team was able to successfully treat both DS and DR infections using the new method. However, the common methods of sensing resistance are limited by time, the requirement for professional personnel, and expensive instruments. Moreover, the abuse of antibiotics causes the accelerated process of bacterial resistance.

It’s easy to see how a simple bandage and light could overcome some of these limitations. Treatment doesn’t have to wait for a doctor to make a diagnosis, and the bandage can get the right sort of drugs applied at the earliest opportunity. What’s more, the person wearing the bandage gets real-time feedback on what’s happening with the infection, if there’s an infection at all. The researchers say it offers numerous benefits over existing treatments that make use of light, including photodynamic therapy or PDT.

We’ve been seeing quite a few upgrades to the traditional bandage in recent years, thanks to advances in science — like the nanofiber mesh that attracts bacteria and draws some of it out, speeding up the healing process. Then there’s the novel bandage for treating burns, which stops bacteria from multiplying and lowers the risk of infection.

The more work that a bandage can do while it’s protecting a wound, the better. Efforts to improve bandages continue and now we've got a bandage that not only releases antibiotics, but also tells the patient exactly what’s going on too.

3 . Do you know that some people have memories that are completely wrong? They remember things that never happened. Sometimes, many people have the same wrong memory. When this happens, it’s believed that it is because of the Mandela Effect.

People first noticed the Mandela Effect in 2013. That year, Nelson Mandela passed away. However, thousands of people remembered him dying in the 1980s. They described watching his funeral on TV. But in fact, Mandela lived to be 95 years old. How could that be? How could so many people have the same wrong memory?

Most experts explain the Mandela Effect using brain science. When we make memories our brains keep them in groups. Each group includes memories that are similar to each other. Sometimes, our brains mess up. They mix two similar memories together. That’s why people thought Nelson Mandela died in the 1980s. They knew he was imprisoned (坐牢) during the 1980s. For some reason, they mixed his imprisonment with his death.

That would explain why so many people in 2013 thought Nelson Mandela was already dead. But would it explain why all those people gave similar descriptions of his funeral? Could all those people have mixed up the same two memories?

Another theory about the basis for the Mandela effect originates from quantum physics (量子物理学) and relates to the idea that rather than one timeline of events, it is possible that alternate realities or universes are taking place and mixing with our timeline. In theory, this would result in groups of people having the same memories because the timeline has been changed as we shift between these different realities. You aren’t alone if you think this sounds a little unrealistic.

There are many other examples of the Mandela Effect. Have you ever seen the Mona Lisa? Many people remember the woman in the painting with a frown or was straight-faced. If you look at the Mona Lisa today, you'll find she’s smiling. Do you know where New Zealand is in relation to Australia? However, there is a community of people who claim to remember New Zealand being northeast instead of southeast.

Are these wrong memories the result of mixed memories, or is there another explanation? Without further science research, we can’t say for sure!

4 . “Good Night Lights” began as a game，with the effort of Steve Brosnihan, a cartoonist volunteering at Hasbro Children’s Hospital. He ______ from room to room drawing and chatting and doing whatever else he can to ______ the sick children up. During one ______ to a teenager who would be in the hospital for the last night, he decided to do something ______ for their final farewell.

As he left, Brosnihan told the ______ to watch the corner near the bus stop from his window. Brosnihan ______ to that spot in a Parking area, and flickered (闪烁) his bike light up toward the ______. To his surprise, the teen flickered his own room lights back ______.

Brosnihan made it a(an) ______ to flicker his bike light to kids as he left for the night as a(an) ______ way to say goodbye. When he mentioned this activity to a friend, owner of a ______ restaurant, the friend agreed to flicker the restaurant’s ______ at 8:30 every night for one minute. The nightly tradition became such a ______ that customers started joining in too.

Good Night Lights has been such a simple, ______ powerful, rallying point(号召力) for the community to support the young patients. For 60 seconds, patients were ______ in a luminous(发光的) dialog with residents.

“It would be very hard not to do this ______ you start,” says Brosnihan. “You do it to represent how much you care for kids and families who ______ a lot during their hard times in hospitals.”

Brosnihan hopes it ______ more. “In my grander dreams, I hope other cities that have children’s hospitals ______ the idea and run with it and ______ their own version of Good Night Lights.” he says.