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 Jan 7 awarded Popular Question Nov 30 comment How do we know particles exist? Aren't they just waves? If there are no distinguishing scientific definitions of waves and particles, then I assume it's more a philosophical question. Thank you for helping me to select the answer. Nov 30 accepted How do we know particles exist? Aren't they just waves? Mar 1 awarded Notable Question Aug 9 awarded Popular Question Dec 1 revised How do we know particles exist? Aren't they just waves? deleted 11 characters in body Dec 1 awarded Editor Dec 1 comment How do we know particles exist? Aren't they just waves? I made an edit to my question in order to explain the comment above. Dec 1 revised How do we know particles exist? Aren't they just waves? added 244 characters in body Dec 1 comment How do we know particles exist? Aren't they just waves? Thank you. But this doesn't really answers the question. How do we know that particles in standard model aren't just our interpretation of waves measurements? What are the evidences for that? Nov 30 asked How do we know particles exist? Aren't they just waves? Nov 24 awarded Student Nov 23 awarded Scholar Nov 23 accepted Does matter with negative mass exist? Nov 23 awarded Commentator Nov 23 comment Does matter with negative mass exist? Nov 23 comment Does matter with negative mass exist? This is correct. But since a) mass is a scalar (not vector); and b) $\vec{r_{AB}}=-\vec{r_{BA}}$; then: $\vec F_{AB}=-\vec F_{BA}$; Nov 23 comment Does matter with negative mass exist? can you please give a reference to such explanation? I think it's wrong. Otherwise, positive mass would also suffer from this chase-escape problem ( en.wikipedia.org/wiki/Gravitation_constant) because the force vector is defined towards the other object, and so it's always opposite for them. Nov 23 comment Does matter with negative mass exist? Many thanks for the answer. But I don't understand the "negative mass "following" the positive mass" phenomena. If you use positive and negative mass in the universal gravitation formula, the result is negative force. But it's applied on opposite directions for both objects, so the must both repel each other. Why doesn't it happen with particles with opposite electric charges? Nov 23 comment Does Earth's Rotation Affect Its Shape? @EMACK, The disk shape is a trade-off between gravitational force to the Earth's center, and centrifugal force due to rotation. The centrifugal force is zero on poles and the largest on the equator. But you can find much more detailed and numeric answer on the link posted by Qmechanic.