Crushing an aspirin is a physical change because the chemical composition of the aspirin remains the same even after it has been crushed.
The Wikipedia entry for aspirin provides some history, including its origin as a willow bark extract, who first synthesized it chemically, and how it evolved to the OTC medication we use today.
Aleve is naproxin sodium, chemically unrelated to the other NSAIDs.
Aspirin or ibuprofen are known to irritate the stomach because they are chemically classified as acids. Acids may irritate the stomach lining. Paracetamol (acetaminophen) is not an acid so it doesn't not irritate the stomach.
It is a plant hormone that is often used in anti-acne treatments. Because it is chemically similar to aspirin (acetylsalicyclic acid), it can also be used to make aspirin. Sources:
Tylox does have aspirin in it
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Aspirin is not a disease, it is a medicine. Hence, aspirin does not require a cure.
81mg is the common dosage for "baby" aspirin
aspirin is an acid... aspirins chemical name is acetylsalicylic acid
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aspirin 81mg