In this experiment, PM2.5 and carbon monoxide levels in a room are tested before and after the lighting of a cigarette.

A Beijing Television segment on the types of masks to use during the COVID-19 epidemic.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains the effectiveness of a disposable medical mask.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains which masks should be used under which situations.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains which masks are ineffective against COVID-19.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest discusses what is dubbed "the selfish mask."

This Beijing Television segment introduces four categories of masks and situations where they're most useful.

Guests on this Beijing Television segment demonstrate how to put on masks properly.

Guests on this Beijing Television segment demonstrate how to remove and dispose of masks properly.

A guest on this Beijing Television segment explains under which situations you can or cannot reuse masks.

A doctor from a health clinic tells how he would rather have patience think about preventative care than treat people who are already sick. The key to curing disease is our good habits.

Can you imagine not using anything plastic related for a whole week? Doing so may actually be much harder than you think!

Ordering takeout while trying to eliminate one's use of plastic is no easy task.

Even though we are taught that we should separate plastics so that we can recycle them, in reality, not all plastics are recyclable.

It's very sad to see what we humans are doing to the Earth. Little things can accumulate and turn into big problems.

Some countries have tried to reduce waste production by reducing the number of trashcans. Perhaps this would be a more effective method if people did not just throw trash onto the street.

Although it's probably impossible to eliminate plastic use completely, we should try our best to contribute to helping save the environment.

A professor discusses human emotions and how they share a close and interconnected relationship with our internal organs.

Professor Fan discusses the relationship between the liver and anger and its correlation with the irritability experienced by females during menstruation.

Professor Fan discusses the relationship between thought and the digestive system and why drivers who drive long distances have gastric problems.

Professor Fan discusses grief and the lungs as well as how immense fear affects our ability to control the kidneys.

Professor Fan discusses how extreme changes in emotion can damage the "Qi" in the five viscera.

Professor Fan explains why you must anger someone to the point of tears during an argument.

Professor Fan emphasizes the importance of rules and having a good grasp of such rules in everything we do.