Discovery cards — click a card, then click a timeline slot to place it
Task: Place each scientist's discovery on the correct year in the timeline. Think about what each experiment revealed and what it left unexplained.
Tip: van Helmont measured mass; Priestley used a candle and mint; Ingenhousz added light; de Saussure identified CO₂; Blackman found two stages; Calvin traced carbon with radioactive labels. Press R to reset.