3 . A diet high in protein is often promoted as part of a healthy lifestyle, and many diets encourage consumers to reduce fats in favor of protein to lose weight and gain lean muscle.

For the study in Nature Metabolism, Bettina Mittendorfer and colleagues found that while increasing the proportion of protein in daily calorie intake is beneficial, consuming protein too much not only doesn’t add to the development of lean muscle but can cause unintended negative health effects.

“Consumers are being led to believe that they can never get too much protein in their diet,” says Mittendorfer. “However, our research shows that specific amino acids (氨基酸), which are the building blocks of protein, can trigger heart disease through a signaling mechanism at the cellular level in the blood.”

An amino acid found in animal-protein foods, such as beef, eggs, and milk, was found to be responsible for signaling activity in cells that typically clear away rubbish in blood vessels. As consumption of dietary protein increases, so does the consumption of leucine (亮氨酸), the specific amino acid responsible for triggering this cellular activity in the blood.

When functioning normally, these cells work to keep blood vessels free from plaque (血小板) buildup. When their production becomes overactive, the resulting accumulation of spent cells in the vascular system can cause the plaque buildup and blockages they are supposed to prevent. The resulting hardening of the arteries (动脉) is a leading risk factor for heart attack and stroke.

“Our hope is to eventually find the Goldilocks approach for maximizing the health benefits of dietary protein, such as building lean muscle, while avoiding the health drawbacks from overconsumption.” says Mittendorfer.

The researchers found that consuming more than 22% of daily calories from protein carries more downside risk than dietary benefit. For a normal adult, 20 to 30 grams of protein per meal, or 60 to 90 grams of protein per day is adequate to support health.

The study combined human trials with experiments in mice and cells.

4 . Glen Edwards became a hero when he rescued a construction worker trapped on top of a 160-meter-high building.

As a crane (吊车) _______ working on a construction site, Edwards _______ found himself in a life-saving mission when a fire broke out. He recalled how he _______ the trapped worker from his crane’s cabin (驾驶舱), and how he came up with the idea of saving the man by lowerin a cage to him to let him _______.

However, his attempt to _______ the cage before the man was by no means an easy job, as each post (弹) of wind prevented to throw his crane off balance. Besides, the smoke and flames also added to the difficulty. _______ the great challenges, Edwards refused to give up and fought to _______ control. Luckily, someone on the ground offered _______ on where to land the cage through a radio. Edwards _______ the crane’s movements, inch by inch, until the cage hanged (盘旋) just inches from the edge of the _______. With determination, Edwards successfully landed the cage.

Eventually, Edwards watched the cage _______ the man away from the horrible fire below and lowering him to safety. The crowd _______ a big round of applause, a tribute (致敬) to the courage and skill _______ by Edwards. He knew that his quick thinking and strong _______ had made all the difference between life and death in the face of disaster.

A GoFundMe page has now been set up to raise money for him —— with organizers _______ people to “buy Glen a beer” for his life-saving efforts.

5 . In recent years, aggression on social media have become commonplace. More than half of the victims said they didn’t know the identity of the perpetrator (作恶者). Most people agreed that the anonymity (匿名) of the Internet provides cover for nasty and harassing (骚扰) behavior.

Does this growing aggression on social media give us a glimpse of our real human nature? Are we-at our core-aggressive beasts? It’s true that hate crimes are on the rise, and political divisions app ear to be growing. The level of public bitterness-especially online-is substantial. But I don’t believe that’s because social media has unlocked our cruel human nature.

As an evolutionary anthropologist, I have spent years researching our transformation as a species. Over the past two million years, we have evolved from groups of apelike beings armed with sticks and stones to the creators of cars, rockets, and nations. Our bigger brains have allowed us to bond and cooperate in more complex and diverse ways than any other animal. Meanwhile, “you are whom you meet.” How we perceive, experience, and act in the world is shaped by who and what surround us on a daily basis. This process has deep evolutionary roots and gives humans what we call a shared reality.

I would argue that the rise in online aggression is a product of our evolutionary social skills, the social media boom, and the specific political, economic and social context where we find ourselves. This explosive combination has opened up a space for increasingly more people to fan the flames of aggression and insult online. Aggressive behavior-especially to those you don’t have to confront face-to-face-is easier than it’s ever been. And for the aggressor, there are often no consequences.

Yes, it seems that the world is getting more aggressive, but that’s not because we are more aggressive at our core. It’s because we haven’t been standing up against bullying, abuse, and aggressive harassment, and promoting pro-social attitudes and actions our contemporary world demands. In person and on social media, we must do both.

Maisie and her car

Maisie usually goes swimming every morning before she goes to work. She leaves home at 5:30 am and drives to the swimming pool. She swims for an hour, and then hurries home for a shower and breakfast before she leaves for work at 8 am.

One Thursday morning, Maisie drove to the swimming pool as usual. She did not feel happy because she had a quarrel (争吵) on the phone with a co-worker the night before. She was still thinking about it and feeling so depressed that she did not want to go to work.

“Swimming may make me feel better. Come on,” Maisie said to herself. She parked the car opposite the sports center, took her sports bag from the back seat and walked to the building, forgetting to put on the handbrake (手刹).

While Maisie was swimming, a strong wind came and the car started to move. Very, very slowly the car moved out of the car park and across the road. It was early morning so the road was empty. There were no people walking around and no other cars on the road.

A few moments later, there was a sudden announcement on the loud speaker system. “Is the owner of a white Honda, number plate XJY436, in the pool?”

“XJY436! That’s my car,” thought Maisie. She swam to the side of the pool and climbed out. A lifeguard was standing next to the pool. Maisie ran up to him. ”That’s my car, “she said.” Did I leave the lights On? “No,” said the lifeguard, laughing. “Come and see.” Maisie followed the lifeguard out to the entrance of the sports center. “Look!” said the lifeguard when he pointed to the big entrance door. “Oh, no!” shouted Maisie. Her car was in the doorway. It was half inside the building and half outside. No one could go in or out of the sports center.

“Do you have your car key?” asked the lifeguard.

Maisie’s entire face instantly turned red.