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These are lessons meant to augment the Labs or your own lessons. Your students may need some, all or none of these lessons. You may have better ways to teach these ideas and skills.

  • Pre Tests - Helps to assess prior knowledge.
  • Microscope - Introduction to the parts of and use of the microscope.
  • Size Under the Microscope - How to determine the size of an object under a student microscope.
  • Mixing the Gene Pool - Why the mixing of the gene pool in sexual reproduction is an advantage.
  • Brooders vs. Spawners - Humans are "brooders" in that we have few young, which we take care of. Sea urchins are "spawners" in that they have millions of young with no parental care. So why study sea urchins?
  • Simple Dilution - Understanding dilution is an essential skill in biology. This lesson starts with an understanding of a simple linear dilution.
  • Simple Dilution 2 - This lesson adds the element of experimentation in beginning to learn about serial dilutions.
  • Sperm Dilution - Proper sperm dilution will help students in doing the EXPERIMENTS lab and provides further understanding of serial dilutions.
  • Drawing - An often neglected scientific tool. What is important to record? How much detail is needed?


  • Overheads - ready to print and use. Some in Spanish and French as well.
  • Glossary - definitions to assist learning of new terms.
  • References - other books to help learning.
  • Skills Needed - list of skills needed for each assignment.
  • Lesson Plans - lessons plans that administrators love to see.
  • Safety - FIRST on most lists. What precautions to take.
  • Path from egg to sea urchin - a fun way to follow sea urchin development from gametes to adults
  • Animations - a ZIP file of all of the GIF animations used on this site.
  • Urchins - How to get them, take care of them, etc.
  • The entire old site as one ZIP file - current site is CMS based, so only the old site works this way, but all the animations, contents, etc. are there.


Resources we have come up with that may help you, as the instructor.


Links to information that may be of a more casual interest to you.

  • History - of this site
  • How We Did It - hardware and software used in constructing this site
  • Our Bios - a little about each of us
  • Polyglot - "sea urchin" in the 11 languages spoken at Hopkins.