One of the many aspects of “normal” life that SARS-CoV-2 took away was the enjoyment of live musical performances. With the easing of lockdowns and restrictions in many parts of the world, performers can entertain audiences once again, but concerns about spreading the virus remain. Now, a research reported in ACS Environmental Au have studied   aerosol (悬浮颗粒) production from playing wind instruments, singing and acting, allowing them to develop recommendations to minimize COVID transmission.

Early in the pandemic, COVID-19 outbreaks from choir performances indicated that singing carries a potential infection risk, but less is known about the risks of airborne infection from wind instruments. To help keep performers, audiences and music students safe, Tehya Stockman, Shelly Miller and colleagues wanted to examine aerosol production and flow in the air from various musical activities, as well as test different solutions.

The researchers examined the extent and speed of air circulation, or small drops of substances, coming from singers’ and actors’ mouths and from wind instruments, such   as the flute, clarinet (单簧管), trumpet and saxophone. They also measured airborne aerosols and carbon dioxide levels exhaled from the performers. They found that aerosol concentrations coming from the bell of a clarinet were comparable to singing. Placing a surgical mask over a singer’s face or over the clarinet bell sharply reduced the extent and speed of air circulation and decreased aerosol concentrations in front of the masks. The team then used these measurements to model virus transmission in indoor and outdoor environments, finding that the lowest risk of airborne COVID-19 infection occurred at less than 30 minutes of exposure indoors and less than 60 minutes outdoors. These findings could help musical rehearsals and performances continue in a safer manner for musicians and audiences, the researchers say.

In 2018 measles ( 麻疹) infected almost 10 million people around the world and killed 420. Countries that achieved high vaccination（苗接种） rates or had formerly eradicated the disease also failed to have narrow escape .

Fortunately, apart from troublesome measles, many inspirational global health stories happened in the last decade, new viruses, vaccines, and treatments were discovered, once again showing the significance of science.

Huge progress was made in virus research. For instance, a kind of virus named Medusavirus, which can turn an amoeba, a kind of single-celled living creature, into a "stone", was identified by Japanese scientists. The virus has one of the largest and most complicated viral genomes(基因组) that have ever been found. Besides, a new virus, Alongshan virus, was discovered in a group of patients in Inner Mongolia. Researchers also found for the first time that an insect RNA virus, the Providence virus, was able to infect plants and mammalian cells, which indicated that plants could serve as hosts of human viruses.

We also saw improvement in treatments and vaccines. Ebola virus is good case in point. According to the Royal Free Hospital in Britain, the drug MIL77, which had been developed by Academy of Military Medical Sciences, an institution in China, jointly with some other companies, was adopted to treat a Briton infected with the disease and helped her recover from the deadly virus. This has indicated China's capability of offering an economical and practical drug fighting Ebola virus worldwide. Furthermore, the Chinese and British medical research teams have worked on genome sequencing of the virus, making it possible to develop drugs and vaccines that are more effective. Therefore, Ebola is no longer a death sentence.

Thanks to investment in global supervision transnational partnership, and scientific research, many new viruses, vaccines, and treatments were successfully discovered in the last decade. But the journey will continue and much more needs to be done. For example, we need to have a deeper understanding of bow climate change influences the spread of infectious diseases

You might make a disgusted face when you notice that the person waiting in their car at the red light next to you is picking their nose,but admit it,you do it too.And while it might be the natural option when there isn't a box of tissues around,it can be bad for you.The main reasons people feel the need to pick their nose is to clear it of dried liquid,stop an itch（痒）,or just because it feels good.Boogers（鼻屎）form when dried liquid and cilia,the tiny hairs that line the nostrils（鼻孔）,trap the dust,dirt,and other things.When boogers build up in your nose,it can be uncomfortable,and sometimes just blowing into a tissue doesn't do the trick.

Otolaryngologist Erich P.Voigt,MD,told Business Insider that picking your nose can cause injuries and bleeding within your nostrils.That's not terribly damaging,but when the bacteria from your hands get into your body,it can cause a cold and flu.So doctors strongly suggest not picking the nose.

If dry winter air is causing the dirty liquid to harden in your nostrils,making you want to pick,consider damping the air at home,or taking a steam shower to soften things up in there.

Children,who are most famous for having a finger up their nose,sometimes don't realize how much injury they're causing,and sometimes it.can lead to nose bleeds.

So,next time you go to pick your nose,think about how many bacteria are on your hands and in your boogers, and maybe reach for a tissue instead.Even if you 're alone,and not waiting for the light to turn green,please,use a tissue.