A powerpoint starting with a short introduction to batteries, Volta's frog's legs and then an investigation plan into fruit batteries. Modify the powerpoint and worksheet for metals available to you. At the end of the powerpoint is an alternative class results table if you wanted to make it a challenge using different fruits instead of metals.

The slides start off showing comparative pictures between a wolf and several different types of dogs. More pictures are accompanied by questions and discussion points about the purpose of selective breeding. An example of selective breeding of cattle is included, followed by wheat. More questions and discussion points are about how certain traits can be bred for. Summary slides about the topic are followed by a controversial form of artifiicial selection: Eugenics. Hope it's helpful!

An overview of stem cells - what they are, where they can be found and what they can be used for, includes in the slides questions and discussion points about the ethics of using stem cells. Also has a slide at the end on the Hayflick Limit.