You might find it hard to imagine gravity as a weak force, but consider that a small magnet can hold up a paper clip, even though the entire earth is pulling down on it.
Harvard theoretical physicist Lisa Randall, one of the smartest women in science today and author of Knocking on Heaven’s Door: How Physics and Scientific Thinking Illuminate the Universe and the Modern World, among others, offers this deceptively simple yet brilliant perspective on grasping gravity.
(via It’s Okay To Be Smart)
LIMHI MONTOYA 
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