Einstein Activity Cards, Kraft & Energie

My 6-year-old dove right into the 20 experiments, and the way each card explains the science behind lifting heavy things really clicks with her. It's kept her busy for hours without any screens involved.

My six-year-old was genuinely amazed when we built the simple pulley from the Kraft & Energie cards, and he actually understood how it lifts a heavy load. The experiments use common household items, so we didn't need to buy anything extra.

The card stock is thick enough to survive my 7-year-old's enthusiastic handling, and the experiments actually use common household items. We've done about half so far, and the instructions are clear enough that I only need to help a little.