An article from Science News May 2020

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An article from Science News Apr 2020

## Ancient recipes led scientists to a long-lost natural blue

An article from Science News Jan 2020

## Color-changing fibers help reveal mysteries of how knots work

Biography

## Abel, Neils Henrik (1802–1829)

Biography

## Aiken, Howard Hathaway (1900–1973)

Biography

## Aleksandrov, Pavel Sergeevich (1896–1982)

Article

## Algae

An informal assemblage of predominantly aquatic organisms that carry out oxygen-evolving photosynthesis, but lack specialized water-conducting and food-conducting tissues. Algae (Fig. 1) may be either prokaryotic organisms (lacking an organized…

Article

## Algebra

The branch of mathematics dealing with the solution of equations. These equations involve unknowns, or variables, along with fixed numbers from a specified system (Fig. 1). The origins of algebra were based on the need to develop equations that…

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## Algebraic geometry

The study of zero sets of polynomial equations. Examples of zero sets of polynomial equations studied in algebraic geometry are the parabola y − x2 = 0, thought of as sitting in the (x, y)-plane, and the locus of all points (t, t2, t3, t4), which is…

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## Allelopathy

A natural process in which harmful or beneficial effects are caused by secondary metabolites that spread from a donor organism to a recipient and are produced by plants, algae, bacteria, and fungi. Allelopathy is a key ecological process and has…