Although you may not be into zombies or eating brains on Halloween this gelatin brain mold for $6.80 is a FUN hands-on way to boost a science or psychology lesson! You can use plaster of paris if you don’t want to use gelatin. Looking for a less messy way to have a brain visual? Learning Resources has a neat Brain cross section model for under $15. I also found a heart gelatin mold for under $7.