Adverse selection occurs in health insurance when there is an imbalance of high-risk, sick people to healthy people. The imbalance can happen due to sick people, who require more insurance, using more ...

Clonal selection is a process proposed to explain how a single B or T cell that recognizes an antigen that enters the body is selected from the pre-existing cell pool of differing antigen ...

What was revolutionary about the clonal-selection theory as a solution to the specificity-of-antibody problem? N. Av Mitchison. Biology in the 1950s was coming to terms with 'DNA and all that'. We saw ...

Brian Beers is a digital editor, writer, Emmy-nominated producer, and content expert with 15+ years of experience writing about corporate finance & accounting, fundamental analysis, and investing.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Eric's career includes extensive work in ...

A series of short films that uses beautiful imagery and inspiring music to celebrate wildlife and the natural world. These clips are from the BBC series Wonders of Nature. Suitable for: Science at KS1 ...