Areference in a literary work to a person, place, or thing in history or another work of literature

a. allusion
b. symbol

Just like exercise, laughter is good for your health. It improves blood flow, strengthens your immune system and lowers blood sugar levels. Additionally, laughter triggers a relaxation response in the brain, which can temporarily relieve pain and help you sleep better.

Laughter also reduces the stress chemicals in your brain and increases the amount of oxygen flowing through your brain and body, which is great for your mental health. Laughing can even turn a negative experience into a positive one and can brighten your mood for the rest of the day. Additionally, people are drawn to you when you laugh because it spreads positivity and good feelings. So, if you want to make some friends, laugh more!

Immune response. Increased stress is associated with decreased immune system response, says Provine. Some studies have shown that the ability to use humor may raise the level of infection-fighting antibodies in the body and boost the levels of immune cells, as well.

Physical release: Have you ever felt like you have to laugh or you'll cry? Have you experienced that cleansed feeling after a good laugh? Laughter provides a physical and emotional release. Internal workout: A good belly laugh exercises the diaphragm, contracts the abs, and even works out the shoulders, leaving muscles more relaxed afterward. It even provides a good workout for the heart.  Social benefits: Laughter connects us with others. Just as with smiling and kindness, most people find that laughter is contagious. So, if you bring more laughter into your life, you can most likely help others around you to laugh more and realize these benefits as well. By elevating the mood of those around you, you can reduce their stress levels and perhaps improve the quality of social interaction you experience with them, reducing your stress level even more!

By reducing the level of stress hormones, you're simultaneously cutting the anxiety and stress that impacts your body. Additionally, the reduction of stress hormones may result in higher immune system performance. Just think: Laughing along as a co-worker tells a funny joke can relieve some of the day's stress and help you reap the health benefits of laughter. T-cells are specialized immune system cells just waiting in your body for activation. When you laugh, you activate T-cells that immediately begin to help you fight off sickness. Next time you feel a cold coming on, add chuckling to your illness prevention plan. Laughter can increase your overall sense of well-being. Doctors have found that people who have a positive outlook on life tend to fight diseases better than people who tend to be more negative. So smile, laugh, and live longer!

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hopes this helps! ;)