Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

aInstitute of Nephrology, Madras Medical College, Member-Secretary, Transplant Authority of Tamil Nadu (TRANSTAN), India bInstitute of Community Medicine, Madras Medical College, India cInstitute of ...

A 20-year-old man is charged with attempted murder for allegedly beating a woman at random with a table leg on a St. Paul LRT platform during rush hour Tuesday — as several witnesses watched without ...

Current political and economic issues succinctly explained. Since taking office, President Donald Trump has significantly escalated the use of third-country deportations in an unprecedented expansion ...

Job growth has slowed, and the ranks of the long-term unemployed are growing. It makes the indignities of the modern hiring process even more frustrating for those in the market. Job-seekers are ...

AI OpenAI CEO Sam Altman says some folk are using AI in 'self-destructive ways' so it's on us as a society to work out how 'to make it a big net positive' AI AI chatbots can be manipulated into ...

Randomness is incredibly useful. People often draw straws, throw dice or flip coins to make fair choices. Random numbers can enable auditors to make completely unbiased selections. Randomness is also ...

- An **element** is the entry on which data are collected. - A **population** is the collection of all the elements of interest. - A **sample** is a subset of the population. - A **sampling frame** is ...