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In the vacuum of space, spacecrafts have to achieve propulsion and steering through more reactive means.

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PlyO TIL McDaniel College offers a class that breaks down South Park episodes and looks at the real world social issues Matt and Trey are portraying
vOGB TIL any American with a DUI charge, no matter how old, will be denied entrance to Canada.
E18lP TIL you’re supposed to flush your water heater every 6 months to avoid calcification and hardening of sediments at the bottom forcing you to replace the water heater if it’s neglected.
D1M4V TIL Sean Astin's adoptive father, John Astin, was the original Gomez of The Addams Family.
neybY TIL that infants require more General Anaesthetic than adults. For example a 6 month old baby requires almost 2x the amount to become unconscious than a 60 year old. My wife is studying Pharmacokinetics and I'm learning vicariously when she explains some the fascinating stuff. PubMed link as ref.