Civil Rights
Movements, leaders, victories and the continuing fight for equality.
Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
Katherine Johnson’s mathematical calculations helped guide some of America’s most important early space missions while she confronted the racial and gender barriers faced by Black women in twentieth-century America.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985

Mnemonics are used to help memorize the electronic color codes for resistors. Mnemonics describing specific and relatable scenarios are more memorable than abstract phrases.
| Color | Value |
|---|---|
| Black | 0 |
| Brown | 1 |
| Red | 2 |
| Orange | 3 |
| Yellow | 4 |
| Green | 5 |
| Blue | 6 |
| Violet | 7 |
| Grey | 8 |
| White | 9 |
| Gold | ±5% |
| Silver | ±10% |
| None | ±20% |
The first letter of the color code is matched by order of increasing magnitude. The electronic color codes, in order, are:
A mnemonic which includes color name(s) generally reduces the chances of confusing black and brown. Some mnemonics that are easy to remember are:
A mnemonic that is taught in classrooms in Canada:
A mnemonic that is commonly taught in classrooms in India:
Mnemonics commonly taught in UK engineering courses include:
This mnemonic is commonly taught in the Netherlands:
Popular in the days of vacuum-tube radios:
The following historical mnemonics are generally considered offensive/outdated and inappropriate for current electronics training:
Casual use in an engineering class has been cited as evidence of the sexism faced by women in scientific fields.[15] Latanya Arvette Sweeney, associate professor of computer science at Carnegie Mellon, mentions yet another as one reason why she felt alienated and eventually dropped out of MIT in the 1980s to form her own software company.[16] In 2011, a teacher in the UK was reprimanded by the General Teaching Council for alluding to an offensive mnemonic and partial use of another.[17] Violet Gave Willingly (2022) is a Canadian short documentary film about Deborah Dumka, and the sexism and misogyny that Dumka encountered when she went to university to study electrical engineering in the 1970s; the film takes its title from use of the mnemonic "Bad Boys Rape Our Young Girls But Violet Gives Willingly".[18]
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
A color code is a system for encoding and representing non-color information with colors to facilitate communication. This information tends to be categorical (representing unordered/qualitative categories) though may also be sequential (representing an ordered/quantitative variable).
An electronic color code is a system which wordlessly identifies either the functions of cables and connections, or the types and variants of electronic components. Codes for cables and connections range from the use of pink, blue, and green connectors on computer sound cards, to early attempts at standardizing the colors of battery, loudspeaker, and antenna wires of radio sets in the 1920s, to the 25-pair color code, used in telecommunications cables. Among the component identification applications, those used on resistors are most widespread, with usage on inductors also popular, while in the past, many variations were applied to capacitors, diodes, and other part types.
The 25-pair color code, originally known as even-count color code, is a color code used to identify individual conductors in twisted-pair wiring for telecommunications.
Mnemonics are used to help memorize the electronic color codes for resistors. Mnemonics describing specific and relatable scenarios are more memorable than abstract phrases.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Shirley Chisholm, elected in 1968.