I read a book called Gravity. In the book it talks about how gravity work and what gravity does.
I learnt the reason why objects fall is because of friction. Friction is a source between two surfaces that are sliding or trying to slide across from each other. I also learnt about Mass vs Distance. Distance is the space between two objects and mass measures how much matter an object hold.
I find this book very educational and (I think) it could help other people learn about gravity.
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