I first saw a crayfish (小龙虾) around 2001. A friend brought one into the office and told me it was a female animal that was reproducing (繁殖) on its own. We realized the new type of animal   was reproducing itself by the millions.

We think that in the 1990s, two crayfish got children either in a pet store or in the wild. Something went wrong and one of the daughters laid eggs without any males. It’s not unusual for such a sudden change like this to happen, but normally, the children can’t live on or reproduce, and the new type won’t spread. For some reason, this daughter and her children did.

In some way, many of the new crayfish appeared in German pet stores. They would naturally increase, and their owners would often set the children free, which let the animals reproduce and spread farther. In 2003, scientists officially proved that animals like crayfish were, in fact, reproducing themselves. They’ve gone from that single female 25 years ago to millions, or maybe billions, of the same crayfish found throughout Europe and Madagascar.

In 2018, we published a map of the clones’ genetic code (克隆类遗传密码图). This type is becoming a really useful tool for researchers like me: We can use crayfish-like animals to study everything from cancer development to the effects of drugs on the brain. Now that we know this code, we can start to try it in the lab. For example, we might try to make these animals grow to larger sizes so people can sell them for food. This is already happening in Madagascar. It turns out that crayfish are pretty tasty. It’s easy to get lots of them too because they grow up in about three months and lay hundreds of eggs. Just put one in a pool and wait.

What do you do when you need to look something up? Go to the library? Open an encyclopedia(百科全书)? Click onto the Internet? These days, most people go straight to Wikipedia, the online encyclopedia. But how reliable is it?

There’s no denying the popularity and usefulness of Wikipedia. It attracts as many as 78 million visitors every month, and the site is available in more than 270 different languages. It’s one of the most comprehensive resources available, which includes almost all details, facts and information that may be concerned. It’s got much more information than an ordinary encyclopedia. The site is updated on a daily basis by thousands of people around the world. Anyone with an Internet connection can log on and edit the contents or add a new page. And you don’t need any formal training.

Of course, there are some controls. Wikipedia has a team of more than 1,500 administrators who check for false information. And main targets for harmful comments(such as politicians) are off-limits to public editing. But with more than 16 million articles to keep an eye on, it isn’t easy. So, while Wikipedia benefits from being constantly updated with information from all over the world, it’s also open to “vandals”（恣意破坏公共财物者）.

Some of the damage is easy to notice. One person drew devil horns and a moustache on Microsoft chairman Bill Gate’s photo, while another edited Greek philosopher Plato’s biography to say he was a “Hawaiian weather man who is widely believed to have been a student of ‘Barney the purple Dinosaur’.

But other things are harder to spot. The most common form of vandalism (恣意破坏公共财物罪) involves adding tiny items of false information into the biography of a famous person. Unbelievably, some of this misinformation has appeared in newspapers, with The Daily Mail, The Guardian and The Independent all having fallen victim to the dirty tricks. For example, in an article about British comedian Sir Norman Wisdom, one newspaper claimed that he co-wrote Dame Vera Lynn’s wartime hit There’ll be bluebirds over the White Cliffs of Dover. He did no such thing. And in other article, it was reported that TV Theme tune composer Ronnie Hazlehurst had written the S Club 7’s hit Reach again, not true. So, if you’re going to use any information from Wikipedia, make sure you double-check it first.

Plenty of past research has found that late-night eating is linked to weight gain, but most studies are observational, and few explain why eating later might have anything to do with why people put on pounds. A recent study, published in Cell Metabolism, sought to address the question by controlling the calories participants ate, how much they slept, and how much physical activity they got so researchers could learn how and why eating later might affect weight.

One of the most significant findings from this report is that “a calorie is a calorie, but the response of your body to that calorie is different in the morning versus in the evening,” said Frank A. J. L. Scheer, the senior author and a scientist at Harvard Medical School.

That finding matches past research showing that the glycemic index (升糖指数) of a food—how it affects the body's blood sugar following a meal—varies depending on the time of day that food is consumed, said Nina Vujovic, who led this study. In the study, Vujovic found that eating within four hours of bedtime affects two hormones (激素) related to hunger.

On days participants ate closer to sleep, they also burned fewer calories and showed molecular changes in fat tissue suggesting their body converted calories into fat storage more easily.

What surprised Scheer most was that eating closer to bedtime affected all the factors they measured rather than just one or two of them. “In the nutrition field, I think the longest resistance against the idea that timing of food matters is based on this simplistic view of‘a calorie is a calorie,’ meaning that it shouldn't matter when someone eats it,” Scheer said, “yet it does.”

But the authors also acknowledged that their study was not designed to determine whether eating dinner closer to bedtime long-term would lead to weight gain over time or whether the body might instead adapt to such a schedule.