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Why Do We Sleep? What Happens If We Don't?, The Environmental Impact of Trump's Wall, and more

Why Do We Sleep? What If We Don't?; Reversible saliva helps frogs eat; Radiation clouds a hazard for frequent flyers; Trump's wall more likely to stop wildlife than people; Lithium ion battery scientist wins Herzberg Gold; Why Isn't Jupiter Solid?
Why Do We Sleep? What If We Don't?; Reversible saliva helps frogs eat; Radiation clouds a hazard for frequent flyers; Trump's wall more likely to stop wildlife than people; Lithium ion battery scientist wins Herzberg Gold; Why Isn't Jupiter Solid? 54:00