Lesson plan

Candling

Candling is a method used in embryology to study the growth and development of an embryo inside an egg. The method uses a bright light source behind the egg to show details through the shell, and is so called because the original sources of light used were candles. The technique of using light to examine eggs is used in the egg industry to assess the quality of edible eggs. File:CDC PHIL 10147 – candling, non-fertile egg.jpg|A non-fertile chicken egg, with only a round yolk sac File:CDC PHIL 10148 – candling, fertilized egg, non-viable.jpg|A non-viable fertilized chicken egg, with a thin blood ring encircling the yolk File:CDC PHIL 10149 – fertilized egg, 11 days old.jpg|A fertilized chicken egg, 11 days old, with blood vessels surrounding the yolk

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Article summary

Candling is a method used in embryology to study the growth and development of an embryo inside an egg. The method uses a bright light source behind the egg to show details through the shell, and is so called because the original sources of light used were candles. The technique of using light to examine eggs is used in the egg industry to assess the quality of edible eggs. File:CDC PHIL 10147 – candling, non-fertile egg.jpg|A non-fertile chicken egg, with only a round yolk sac File:CDC PHIL 10148 – candling, fertilized egg, non-viable.jpg|A non-viable fertilized chicken egg, with a thin blood ring encircling the yolk File:CDC PHIL 10149 – fertilized egg, 11 days old.jpg|A fertilized chicken egg, 11 days old, with blood vessels surrounding the yolk

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Discussion questions

  1. Summarise the article in your own words. Which single claim would you verify first, and why?
  2. Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
  3. If two sources disagreed about one of these facts, what would you need in order to trust one over the other?

Bibliography

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Key claims and bibliography are generated from the same tracked claims and sources as the article page.