When the flowers are frozen in liquid nitrogen, they become brittle and shatter like glass!
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Read more: Smashing Flowers in Liquid Nitrogen
Heat is conducted at different rates along rods of different metals. You can show this with wax and a blowtorch!
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Read more: Thermal Conductivity
Watch what happens when pressure builds to the breaking point!
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DO NOT DO THIS YOURSELF!
As the liquid nitrogen is poured over the eraser bits, they start to pop and jump!
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Read more: Making Erasers Explode with Liquid Nitrogen
See hot and cold water mix in infrared.
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Read more: Mixing Hot and Cold in Infrared Vision