Rlsms.com. R.L. Stevenson Middle School. BrainPOP - Animated Educational Site for Kids - Science, Social Studies, English, Math, Arts & Music, Health, and Technology. TeenBiz3000: The Leader in Differentiated Instruction. Mr. Cogbill's Class. Student Resources - Mr. Cogbill's Class. Welcome to Discovery Education. SCIENCE CAREERS. 7th Grade Life Science - Mr. Cogbill's Class. Quarter 1 Inquiry Links. Quarter 2 Cells Links. Quarter 3 Genetics Links. Quarter 4 Ecosystems Links. Pinnacle Internet Viewer Logon.