SCIENCE The Tears of an Astronaut In space, no one can hear you scream. But can they hear you cry? In this new video, Canadian Space Agency Astronaut Chris Hadfield demonstrates the physics of tears in space. Discussion Ideas: The final words spoken by Chris Hadfield, the astronaut in the video, are “It’s gravity.” Actually, it’s surface tension in zero-gravity! Can students explain how a lack … Continue reading The Tears of an Astronaut