Beer mats make bad frisbees

What makes a frisbee stay in the air for so long? By creating a specialised throwing device, researchers determined that torque — the force that produces rotation — is responsible for causing spinning disks to fall out from the sky. However, at certain angles, torque causes flat disks (like beer mats) to flip around. So what makes the frisbee different? Their rounded edges reduce the amount of torque they experience, making their flight more stable.
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