Answer
Electric repulsion between the floor's atoms and our own is the source of the normal force that keeps us from passing through each other.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Reading Check Questions (Comprehension) - Page 223-224: 12
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