Devon King's - Put a metal spoon into a glass before pouring in any hot liquid - this will prevent the glass from cracking. The metal spoon conducts the heat away from
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Alex Zorach's Tea Blog: Why Does Glass Break Or Shatter When Pouring Boiling Water Into It? On Thermal Shock
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Boiling it down to the bubbles: It is about heat transfer – A Lab Aloft (International Space Station Research)
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