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A new review by researchers from Germany and Denmark examined how noises, such as airplanes or jackhammers, affect (影响) our hearts. Most obviously, loud sounds can wake you up. But even if you don't remember the noise or leave your bed, it can still harm your body in ways you may not notice.

"Noise is not just causing annoyance, but it actually makes us sick," said Dr Thomas Münzel, a professor at Johannes Gutenberg University Mainz. "Regardless of where the sound is coming from, if it gets louder than 60 decibels (分贝), it can increase the risk of heart disease."

When our body hears these noises, our body feels stress. In this case, these sudden and unexpected noises cause hormones (荷尔蒙) to speed up and eventually impair the heart. Although the chance that a single noise will affect you is unlikely, it's the continuous contact with the sound that can finally affect you.

"But our heart health isn't the only cause for concern. Long-term noise may also raise the risk of other diseases such as type 2 diabetes, depression, and anxiety disorders," he warns. In the future, Münzel plans to examine how noises from cars, planes, and other vehicles affect the brain. But despite the amount or the depth of research he leads, it'll need help from politicians to improve the effect of noise on our health. "Politicians have to take into consideration, in particular, the new findings," Münzel said, "As for airplane noise and airports, it is important to make new laws and set new lower noise limits that protect people living close by the airport instead of the owners of the airport."

Mutterer handed out the notes along with diplomas (毕业文凭) at the graduation ceremony. "He teared up a bit. I knew it would happen. Then he mentioned the personal letters — 443 of them," said graduate Eduardo Estrada to NBC DFW. "I couldn't believe he had written a letter to every student here. "

Explaining his action, Mutterer recalled receiving a similar encouraging note in high school. "I still have a letter from my government teacher. I was supposed to be a fourth-or fifth generation farmer, but he told me I could go to college and succeed. Someone saw promise in me that I didn't see," he said.

Having worked at the school for 23 years, Mutterer transitioned (转变) from a basketball coach to principal. "He didn't want to be seen just as a principal; deep down, he's a coach and teacher," noted graduate Andrea Lozada. Though he never taught these seniors, he knew them well. The letters praised individual achievements, used nicknames, and wished them well at their future schools.

Each note included a $1 bill, aiming to inspire them to pass on kindness. "A single dollar may seem small, but $443 together can cover a car payment, electric bill, or new shoes," Mutterer explained.

On Facebook, he wrote, "These 443 handwritten letters with a dollar are small acts of kindness. They can start a wave of positive change. No kindness is too small. Take Summit Love to a world that needs it—and you."

Wildlife conservation volunteering plays an important role in protecting endangered species like elephants from disappearing due to habitat (栖息地) loss. Opportunities at rescue centers or reserves include caring for injured wildlife, observing species for research, and anti-poaching (反偷猎) efforts.

Join us and you can make a difference and help protect biodiversity!

●Best Places to Volunteer

Africa

If you want to experience African wildlife from up close, look at South Africa, Kenya, or Namibia for volunteer projects. Not only do they offer a great amount of wildlife on land, but some of them are also home to many sea animals.

Latin America

If you are interested in volunteering with primates (灵长类动物) in their jungle habitats, look no further than Central and South America. Peru, Brazil and Ecuador all share parts of the Amazon rainforest.

●Who Can Volunteer?

As long as you are willing to learn and treat the wild animals with the necessary respect and care, you are more than welcome to volunteer. It doesn't matter if you have any related working experience before.

You need to speak at least basic English, the main language spoken at most projects. Some projects in Latin America will ask you to speak basic Spanish.

Besides, volunteer projects working with wild and more dangerous animals accept volunteers aged 18 but there is no age limit upwards — as long as you are physically fit and ready for a challenge, you are the perfect person to volunteer.

1. 智能图书馆的设施；

2. 你的体验和感受。

Dear Michael,

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Yours,

Li Hua