All 67 people on board the plane and the helicopter were killed. An American Airlines regional jet went down in the Potomac River near Washington, D.C.'s Ronald Reagan Washington National Airport ...
Depending on their age, a person needs 7–17 hours sleep in every 24 hours. But, just sleeping is not enough. Deep sleep is essential for health and wellbeing. Most adults need around 1.5–2 hours of ...
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