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Evolution through natural selection
Nature & Environment

Evolution through natural selection

...C). He added to each group C pond one individual of a fish called Crenicichla alta, which is a particularly voracious predator of guppies. To each group B pond he added six individuals of another predatory fish called Rivulus hartii, which does not prey on guppies. No fish were added to the group A ponds. The ponds were then left alone for a further five months (time for...
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Level 1: Introductory 4 hrs
Climate change
Nature & Environment

Climate change

...c): c =fλ ...Climate change: 1.2 What determines the Earth's GMST? - The Sun is the ultimate source of energy for the Earth's climate. A planet such as the Earth will have a stable temperature as long as there is a balance between the rate at which energy comes in from the Sun and the rate at which it is returned to space by the planet. If the two rates fail to match,...
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Level 2: Intermediate 18 hrs
World-Changing Women: Madam CJ Walker
History & The Arts

World-Changing Women: Madam CJ Walker

...C. J. Walker was by far the wealthiest African American woman in the country. She was invited to meetings of black leaders and was to lecture on business and politics. She spoke out on the social conditions endured by African Americans and devoted particular attention and money to the campaign to make lynching a federal crime. She died in 1919, at the age of fifty one....
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Article 5 mins
How to manage the digital-related stress of technology
Health, Sports & Psychology

How to manage the digital-related stress of technology

...C. A. (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences, 112(4), 1232-1237. Cheever, N. A., Rosen, L. D., Carrier, L. M., & Chavez, A. (2014). Out of sight is not out of mind: The impact of restricting wireless mobile device use on anxiety levels among low,...
View article How to manage the digital-related stress of technology
Article 10 mins
A Victorian Christmas: Thackeray goes to the pantomime
History & The Arts

A Victorian Christmas: Thackeray goes to the pantomime

...c. &c. &c. Perhaps these are not the pantomimes we really saw; but one description will do as well as another. The plots, you see, are a little intricate and difficult to understand in pantomimes; and I may have mixed up one with another. That I was at the theatre on Boxing-night is certain--but the pit was so full that I could only see fairy legs glittering in the...
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Article 10 mins
Picturing the family
History & The Arts

Picturing the family

...c.1914 - [Figure 3 A photograph of two people] Image 3 Photographer/Painter: Anon. [Figure 4 A photograph of two people] Image 4 Photographer/Painter: Anon. In Britain, standardization and mass production in photography came with the introduction of the carte de visite from c.1860. A larger version known as the cabinet appeared in 1866. Cartes and cabinets were paper...
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Level 1: Introductory 12 hrs
The Ancient Olympics: bridging past and present
History & The Arts

The Ancient Olympics: bridging past and present

...C. (1976) The Ancient Olympic Games, in Killanin, L. & Rodda, J. (Eds.), The Olympic Games (pp. 24-26). New York, Macmillan. Web links Olympic History The Ancient Olympics Lämmer, M. “The peace philosophy of the Olympic movement: A historical perspective”. In 7 Uluslararasi Spor Bilimleri Kongresi 27-29 Ekim 2002...The Ancient Olympics: Bridging past and present: 3...
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Level 1: Introductory 5 hrs
Understanding depression and anxiety
Health, Sports & Psychology

Understanding depression and anxiety

...c, d) have the potential to activate the biological stress response. Despite Selye’s broad definition of stress, when used in the context of emotional disorders, the term is generally taken to mean negative stress (or distress). Unfortunately it is virtually impossible to live a life free from this form of stress and whilst it has been suggested that the experience of...
View course Understanding depression and anxiety
Level 2: Intermediate 8 hrs