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Why do some objects feel colder when in reality they are the same temperature?

In this video pedestrians in a park are asked why a hard drive and a book sitting at the same temperature have a different temperature feel to them.  The hard drive feels colder than the book.  He then takes an aluminum plate and a plastic plate to see which plate melts ice quickly.  Even though the aluminum plate feels colder, it melts the ice quickly.  This is a good experiment to try with your students.

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