Tour & travel and Management

Coronavirus It is caused by a member of the coronavirus family that has never been encountered before. Like other coronaviruses, it has come from animals. Many of those initially infected either worked or frequently shopped in the Huanan seafood wholesale market in the centre of the Chinese city. What are the symptoms this coronavirus causes? The virus can cause pneumonia. Those who have fallen ill are reported to suffer coughs, fever and breathing difficulties. In severe cases there can be organ failure. As this is viral pneumonia, antibiotics are of no use. The antiviral drugs we have against flu will not work. Recovery depends on the strength of the immune system. Many of those who have died were already in poor health. Should I go to the doctor if I have a cough? In the UK, the medical advice is that if you have recently travelled from areas affected by coronavirus, you should: stay indoors and avoid contact with other people as you would with the flu c...

Star A star is a huge glowing ball of hot gas, mainly hydrogen and helium. The temperature is so high in its core that nuclear fusion occurs, producing energy. The outward pressure of gas heated by fusion is balanced by the inward pull of gravity, leaving the star in hydrostatic equilibrium. This balance of forces lasts for most of a star’s life, maintaining its steady temperature. Radiation and convection carry the energy from the core out through a star’s atmosphere. When the energy gets high enough in the atmosphere that the region above it is transparent, it escapes out into space as light of all wave- lengths, as well as stellar wind. Though stars may appear static, they rotate and vary in luminosity. There are hundreds of billions of stars in the Milky Way Galaxy alone. Among them is our Sun, the closest star to Earth. Where do stars come from? Every star forms in a huge cloud of gas and dust. Over time, gravity causes the cloud to contract, draw...

The Sun The visible part of the sun is about 10,000 degrees Fahrenheit (5,500 degrees Celsius), while temperatures in the core reach more than 27 million F (15 million C), driven by nuclear reactions. One would need to explode 100 billion tons of dynamite every second   to match the energy produced by the sun, according to NASA. The sun is one of more than 100 billion stars in the Milky Way. It orbits some 25,000 light-years from the galactic core, completing a revolution once every 250 million years or so. The sun is relatively young, part of a generation of stars known as Population I, which are relatively rich in elements heavier than helium. An older generation of stars is called Population II, and an earlier generation of Population III may have existed, although no members of this generation are known yet ormation & evolutio he sun was born about  4.6 billion years ago . Many scientists think the sun and the rest of the solar system formed from a...

Brain Tumor A brain tumor is a collection, or mass, of abnormal cells in your brain. Your skull, which encloses your brain, is very rigid. Any growth inside such a restricted space can cause problems. Brain tumors can be cancerous (malignant) or noncancerous (benign). When benign or malignant tumors grow, they can cause the pressure inside your skull to increase. This can cause brain damage, and it can be life-threatening. Brain tumors are categorized as primary or secondary. A primary brain tumor originates in your brain. Many primary brain tumors are benign. A secondary brain tumor, also known as a metastatic brain tumor, occurs when cancer cells spread to your brain from another organ, such as your lung or breast. Types of brain tumors Primary brain tumors Primary brain tumors originate in your brain. They can develop from your: brain cells the membranes that surround your brain, which are called meninges nerve cells glands Primary tumors can be be...

Business Law Business law is sometimes called mercantile law or commercial law and refers to the laws that govern the dealings between people and commercial matters. There are two distinct areas of business law; regulation of commercial entities through laws of partnership, company, bankruptcy, and agency and the second is regulation of the commercial transactions through the laws of contract. The history of these types of laws dates back several centuries and can be seen in the peace-guilds where members would pledge to stand by each other for protection. A lot of business law involves trying to prevent problems that can hurt the business or cause legal disputes. Business law may include any of the following: Business formation Business law starts with setting up a business. In the eyes of the law, each business is their own legal entity. Starting a new business typically starts with filing the paperwork that makes the business formally exist in the government’s eyes. ...