TEDxManhattanBeach - John Bennett - Why Math Instruction Is Unnecessary; the math required for 'real life' is usually attained by 10 yoa, beyond that brain games are of greater benefit than higher math to the majority of students.
Release ladybugs for some simple science discoveries! My pre-k kids enjoyed them for several days. You put them in the refrigerator and they go to sleep. Take them out and enjoy watching the kids interact with them.