Updated Benchmarks

Made some tweaks to the first 2 phases of our Minecraft simulation. I felt the need to change/add more photos w/ brief explanations to help give the students more context. I can already hear my students asking me, "How old are those tools?" and "Where did they find this?" I have also decided to take out the column that asks the students to look for photos from today's world. I would rather have students focus on capturing images from Minecraft and making insightful, written connections.