New footage shows NASA astronaut Christina Koch training ahead of her Artemis II mission earlier this year. Astronauts use underwater training because the buoyancy of water creates a near-weightless environment where they neither sink nor float, allowing them to rehearse spacewalks and build muscle memory for handling equipment in space. 🎥 @achintyabairat #nasa #christinakoch #space #artemis

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Why Does My Dog Still Have Balls After Surgery? Third Opinion Update