Diseases, Conditions, Syndromes

Do masks help boost COVID immunity?

Could the mask—already seen by many scientists as the most effective shield against COVID-19—have yet another benefit? Some researchers now believe that they expose wearers to smaller, less harmful doses of the disease ...

Diseases, Conditions, Syndromes

One more reason to wear a mask: You'll get less sick from COVID-19

As states increasingly promote face masks as a way to control the spread of COVID-19, the top-line message has been: Wear a mask to protect others. While it's true that most face masks are more effective in preventing you ...

Health

Dutch 'abortion ship' due in Guatemala

A Dutch "abortion ship" was Thursday due to arrive in a Guatemalan port to provide free help to women to end unwanted pregnancies, aiming to circumvent the country's strict laws.

Attention deficit disorders

Study seeks to treat children with ADHD by retraining their brains

In the U.S. alone, more than $100 billion a year is spent treating the more than six million children diagnosed with attention-deficit/hyperactivity disorder (ADHD). An international team, led by researchers from The Ohio ...

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Ship

A ship /ʃɪp/ Audio (US) (help·info) is a large vessel that floats on water. Ships are generally distinguished from boats based on size and passenger capacity. Ships may be found on lakes, seas, and rivers and they allow for a variety of activities, such as the transport of people or goods, fishing, entertainment, public safety, and warfare.

Ships and boats have developed alongside mankind. In major wars, and in day to day life, they have become an integral part of modern commercial and military systems. Fishing boats are used by millions of fishermen throughout the world. Military forces operate highly sophisticated vessels to transport and support forces ashore. Commercial vessels, nearly 35,000 in number, carried 7.4 billion tons of cargo in 2007.

These vessels were also key in history's great explorations and scientific and technological development. Navigators such as Zheng He spread such inventions as the compass and gunpowder. Ships have been used for such purposes as colonization and the slave trade, and have served scientific, cultural, and humanitarian needs.

As Thor Heyerdahl demonstrated with his tiny boat the Kon-Tiki, it is possible to navigate long distances upon a simple log raft. From Mesolithic canoes to today's powerful nuclear-powered aircraft carriers, ships tell the history of humankind.

This text uses material from Wikipedia, licensed under CC BY-SA