Vicky from Kauai asked me about connecting density concepts to her biology class. She is specifically interested in connections to cells idea. Here are some ideas:

1. Cell density (e.g. the number of cells per unit volume. Often cell density is denoted as viable cell density which is the number of living cells per unit volume. This is important in blood cell counts, algae counts, etc).

2. Cell density itself (i.e. density of cell's inner fluids and organelles), which is a new technological development (see attached article) and can aid in the detection of diseases such as malaria and leukemia as well as blood doping. Here's a link to the article too: http://web.mit.edu/newsoffice/2011/cell-density-0621.html

3. Density dependent inhibition in cellular communication.

4. The importance of density to living things with respect to environment (e.g. formation of water layers, currents, floating and sinking).

5. Population density (e.g. of humans, bacteria, plants, etc).

Aloha,
kanesa