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FIRST CLUE: Toffee sticks to almost everything. FIRST CLUE: Toffee sticks to almost everything. SECOND CLUE: Toffee sticks to apple skin but not peeled apple. FIRST CLUE: Toffee sticks to almost everything. SECOND CLUE: Toffee sticks to apple skin but not peeled apple.
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FIRST CLUE: Toffee sticks to almost everything. • SECOND CLUE: Toffee sticks to apple skin but not peeled apple.
FIRST CLUE: Toffee sticks to almost everything. • SECOND CLUE: Toffee sticks to apple skin but not peeled apple. • THIRD CLUE: Pieces of toffee can easily be peeled from the apple surface. • FOURTH CLUE: When the toffee is lifted away, the apple surface looks clean but feels sticky, and water spreads on it.
FIRST CLUE: Toffee sticks to almost everything. • SECOND CLUE: Toffee sticks to apple skin but not peeled apple. • THIRD CLUE: Pieces of toffee can easily be peeled from the apple surface. • FOURTH CLUE: When the toffee is lifted away, the apple surface looks clean but feels sticky, and water spreads on it. • FINAL CLUE: Geckos stick to walls using weak Van der Waals forces