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ELI5: How do backcountry skiers and snowboarders know how fast to go when jumping off cliffs, etc. so that they clear any obstacles and avoid injury, especially if no one has ever skied there before?
ELI5: Sometimes when media posts photos of people that are in a coma, had a severe traumatic brain injury, or have mental impairments - you can somehow tell from their facial features. How is that possible, and what facial changes causes this?
ELI5: How is it that PM2.5 (or similar forms of pollution) cause premature deaths both in short (e.g. same weekend as the pollution) and in long (e.g. 20 years) term? What is the mechanism? And how is city pollution different - in terms of consequences - than a dusty day in the desert?
ELI5:Why are policy makers obsessed with economic growth? What about in countries where population has naturally plateaued or is in decline? Why is it reasonable to expect growth ad infinitum?
ELI5:What exactly does it mean when it's said that gravity is the weakest force? What other forces are they comparing it too? And how can it be compared to something else entirely different?