This week鈥檚 new questions
On a bike, would there be any benefit in a taller rider having bigger wheels? And do humans provide any benefit to planet Earth other than for ourselves?
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On a bike, would there be any benefit in a taller rider having bigger wheels? And do humans provide any benefit to planet Earth other than for ourselves?
Gravitational waves arise when very heavy objects spiral into each other, but is there a lower limit to this? Do we create them in our daily activities?