gravity

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History of Western State Hospital (dshs.wa.gov) Western State Hospital is located on the site of historic Fort Steilacoom, which served as a military post from 1849 to 1868 until the federal government abandoned it. The Washington territory purchased the fort with the intent of turning it into a hospital for people who suffered from mental illness. The hospital, then called the Insane Asylum of Washington Territory, opened in 1871 with 15 male and six female patients.

I used to think that I was stupid, and then I met philosophers. Terry Pratchett, Small Gods
I was sitting in a chair in the patent office at Bern when all of sudden a thought occurred to me: If a person falls freely he will not feel his own weight. I was startled. This simple thought made a deep impression on me. It impelled me toward a theory of gravitation. Albert Einstein
There is no difference in the gravitational behavior of matter and antimatter. In other words, antimatter falls down when dropped, not up.

Gravity (Wikipedia) In physics, gravity (from Latin gravitas ‘weight’) is a fundamental interaction which causes mutual attraction between all things that have mass. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.