• two slices of cold butter
• a metal knife
• a plastic knife
• a glass of warm water

1. Poke each knife into a piece of butter.
2. Put the handles of the knives into the glass of warm water with the butter slices sticking up in the air, and wait. Watch to see which butter slice melts off first.

From which knife did the butter melt off first?

the metal knife
the plastic knife
they came off both knives at the same time

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