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A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep.[1] The content and purpose of dreams are not fully understood, although they have been a topic of scientific, philosophical and religious interest throughout recorded history. Dream interpretation is the attempt at drawing meaning from dreams and searching for an underlying message. The scientific study of dreams is called oneirology.[2]

Dreams mainly occur in the rapid-eye movement (REM) stage of sleep—when brain activity is high and resembles that of being awake. REM sleep is revealed by continuous movements of the eyes during sleep. At times, dreams may occur during other stages of sleep. However, these dreams tend to be much less vivid or memorable.[3] The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes.[3] People are more likely to remember the dream if they are awakened during the REM phase. The average person has three to five dreams per night, and some may have up to seven;[4] however, most dreams are immediately or quickly forgotten.[5] Dreams tend to last longer as the night progresses. During a full eight-hour night sleep, most dreams occur in the typical two hours of REM.[6] Dreams related to waking-life experiences are associated with REM theta activity, which suggests that emotional memory processing takes place in REM sleep.[7]

Opinions about the meaning of dreams have varied and shifted through time and culture. Many endorse the Freudian theory of dreams – that dreams reveal insight into hidden desires and emotions.[qualify evidence] Other prominent theories include those suggesting that dreams assist in memory formation, problem solving, or simply are a product of random brain activation.[8]

Sigmund Freud, who developed the psychological discipline of psychoanalysis, wrote extensively about dream theories and their interpretations in the early 1900s.[9] He explained dreams as manifestations of one's deepest desires and anxieties, often relating to repressed childhood memories or obsessions. Furthermore, he believed that virtually every dream topic, regardless of its content, represented the release of sexual tension.[10] In The Interpretation of Dreams (1899), Freud developed a psychological technique to interpret dreams and devised a series of guidelines to understand the symbols and motifs that appear in our dreams. In modern times, dreams have been seen as a connection to the unconscious mind. They range from normal and ordinary to overly surreal and bizarre. Dreams can have varying natures, such as being frightening, exciting, magical, melancholic, adventurous, or sexual. The events in dreams are generally outside the control of the dreamer, with the exception of lucid dreaming, where the dreamer is self-aware.[11] Dreams can at times make a creative thought occur to the person or give a sense of inspiration.[12]

Kepler-452b (a planet sometimes quoted to be an Earth 2.0 or Earth's Cousin[3][4] based on its characteristics; also known by its Kepler Object of Interest designation KOI-7016.01) is an exoplanet orbiting the Sun-like star Kepler-452 about 1,402 light-years (430 pc) from Earth in the constellation Cygnus. It was identified by the Kepler space telescope, and its discovery was announced by NASA on 23 July 2015.[5] However, a study in 2018 by Mullally et al. implied that statistically, Kepler-452b has not been proven to exist and must still be considered a candidate.[6] It is the first potentially rocky super-Earth[7] planet discovered orbiting within the habitable zone of a star very similar to the Sun.[8]

The planet is about 1,400 light-years away from the Solar System. At the speed of the New Horizons spacecraft, about 59,000 km/h (37,000 mph), it would take approximately 26 million years to get there.[9]
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Scientists have revealed the first picture of how the new coronavirus SARS-CoV-2 binds with human respiratory cells in order to hijack them to produce more viruses.

Researchers led by Qiang Zhou, a research fellow at Westlake University in Hangzhou, China, have revealed how the new virus attaches to a receptor on respiratory cells called angiotensin-converting enzyme 2, or ACE2.

"They have pictures all the way down at the level of the atoms that interact at the binding interface," Thomas Gallagher, a virologist at Loyola University Chicago who was not involved in the new research but studies coronavirus structure, told Live Science. That level of information is unusual at this stage of a new virus outbreak, he said.

"The virus outbreak only began to occur a couple months ago, and within that short period of time, these authors have come up with information that I think traditionally takes much longer," Gallagher said.

That's important, he said, because understanding how the virus enters cells can contribute to research on drugs or even a vaccine for the virus.

Coronavirus disease (COVID-19) is characterized by mild symptoms including a runny nose, sore throat, cough, and fever. Illness can be more severe for some people and can lead to pneumonia or breathing difficulties.
More rarely, the disease can be fatal. Older people, and people with other medical conditions (such as asthma, diabetes, or heart disease), may be more vulnerable to becoming severely ill.

What is coronavirus?
Coronaviruses are a large family of viruses which may cause illness in animals or humans. In humans, several coronaviruses are known to cause respiratory infections ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). The most recently discovered coronavirus causes coronavirus disease COVID-19.

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