I introduced students to two additional extra credit activities in class today. The first involves a bit of experimenting with salt water, crayons and eggs at home and is an extension on a demonstration that we did in class. If you are interested in that task, ask your students. They should have a good idea of what is expected.
The second involves explaining why the image attached to this email is funny. Students can either write a written description of what makes the image funny or can create a comic strip that teaches a similar point to readers.
Hope this helps,