1. Click on the face-down card in the deck to reveal the chemical event.
2. Drag and drop the card onto the timeline below. You can place it in between cards that are already positioned.
3. Arrange them in chronological order from left to right, row by row.
4. Click on "Check Timeline" to reveal the actual years and verify your sequence!
Next card in deck (0 remaining)
Your Timeline (Oldest event top-left ➔ Newest bottom-right)Cards placed: 0