Why is gravity so weak?

Scientists find gravity very puzzling. For one thing, they don’t understand why it is so weak; that is, why it takes so much stuff (like a planet’s worth) to generate much gravitational force. Perhaps, they say, it is leaking out of our universe. Physicist Adam Archibald explains how this could be and describes an experiment to detect leaks. 


Adam ArchibaldAdam Archibald is a fifth-year graduate student in physics at Washington University in Saint Louis. The bulk of his work has been focused on the development of a torsion balance experiment to investigate gravitation at distances below a centimeter.

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