A bowl of water. Two paper boats. You're trying vinegar. We're trying cream.
Aha! The cream works. Why? It changes the surface tension. Cream and milk are first-class sources of nutrition.
That's why there's a glass and a half of full cream milk in every 200 gram block of Cadbury Dairy Milk Chocolate.
Are we agreed? Yes, Professor.
Only Cadbury has that famous glass and a half. So when you think of chocolate, think of Cadbury.