Formed in the Big Bang and inside extremely dense stars, strangelets are thought to be made from quarks - the subatomic particles found inside protons and neutrons. Unlike ordinary matter, however, they also contain "strange quarks", particles normally only seen in high-energy accelerators.
Strangelets - sometimes also called strange-quark nuggets - are predicted to have many unusual properties, including a density about ten million million times greater than lead. Just a single pollen-size fragment is believed to weigh several tons.
Very interesting stuff. (Link via Ezra Klein.)
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