Why Is Nuclear Fusion Always 30 Years Away?
The joke is old and the reason is specific: fusion needs conditions that only exist inside stars, and building them on Earth costs more energy than the reaction has so far returned.
energy
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Why Does Your Phone Battery Get Worse Over Time?
A lithium-ion battery is a chemical system that wears out as it works. Every charge cycle costs a little capacity permanently, and heat costs far more than cycles do.
What Is a Carbon Footprint?
A carbon footprint is the total greenhouse gas released by an activity, converted into an equivalent weight of carbon dioxide so different gases can be added together.
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