may10baby:

dexer-von-dexer:

stem-stims:

Physics: More pencil tricks

Source

i.e. why when you or someone else gets stabbed or impaled, you should leave the object in the wound until medical help arrives.

i.e. why fire departments will saw off the metal poles motorcyclists sometimes find themselves impaled on, delivering them to shock trauma with a nine foot pole through their chest.