Some things to avoid/take caution of:
-Don't dip the heat glass into cold water - it'll either shatter the glass, or make it very brittle
-Make sure you have the proper equipment: goggles, metal claw (for holding class), it can get hot and even somewhat dangerous
-If the glass parts DO break, make sure to watch out for the sharp parts at the ends of the glass and be sure to clean up any broken bits
Science:
-to bend the glass tube, you have to heat up the area you wish to bend until it is immensely hot
-a sudden decrease in temperature raises the chance of the glass shattering
-if a warm glass tube is filled quickly with cool water, some steam may be produced

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