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Start your scheming now for SUNDAY'S WRITE-A-THON! January 31, 2021
Theme: To be announced

We'll name a theme here soon.

If the theme topic is not for you, please just be a party pooper and drop by to write about anything else!

We know that not everybody has Sunday at the same time though, so to make it fair our Sunday lasts 48 hours! Therefore, the Write-a-Thon starts when it is Sunday at midnight (in Sydney) and ends when it becomes Monday in San Francisco.

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Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We write the kinds of articles that Wikipedia can't write. We welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive.

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Citable Articles (158)
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Man's mind stretched to a new idea never goes back to its original dimensions.
Oliver Wendell Holmes (1809–1894)
       —add a quotation about knowledge or writing
Did You Know?

Featured Article: COVID-19

(CC) Image: NIAID
SARS-CoV-2 (in yellow), the virus that causes COVID-19, revealed in an electron microscope image as it emerges from cell surfaces (blue/pink).

COVID-19 is a disease that results from infection with SARS-CoV-2, a coronavirus that apparently first infected human populations in Wuhan in the People's Republic of China towards the end of 2019. The disease was first described as an atypical ‘viral pneumonia’, and by January 2020, the infectious agent had been identified as a novel coronavirus. The origin of the infectious agent is uncertain: the current consensus is that it probably originated in bats, and that a novel mutated form of the virus, in which a spontaneous mutation had enabled the virus to infect humans, may have infected humans through interactions between live bats and people at a wild food market in Wuhan.


The median incubation period for COVID-19 is estimated to be 4-5 days after exposure, but incubation periods of up to 14 days have been reported in exceptional cases. The spectrum of illness ranges from asymptomatic infection to severe pneumonia with acute respiratory distress syndrome and death. Of about 70,000 persons with COVID-19 in China, 81% cases were classed as mild, with no pneumonia or mild pneumonia, 14% as severe (defined as dyspnea, respiratory frequency ≥30 breaths/min, saturation of oxygen ≤93%, a ratio of arterial partial pressure of oxygen to fraction of inspired oxygen <300 mm Hg, and/or lung infiltrates >50% within 24 to 48 hours), and 5% as critical (respiratory failure, septic shock, and/or multiorgan dysfunction or failure).

Among more than 370,000 confirmed COVID-19 cases with reported symptoms in the USA, 70% of patients experienced fever, cough, or shortness of breath, 36% had muscle aches, and 34% reported headaches. Other reported symptoms included diarrhoea, dizziness, rhinorrhea, anosmia, dysgeusia, sore throat, abdominal pain, anorexia, and vomiting.