October 19

Salimuzzaman Siddiqui, the natural-products chemist known for isolating compounds from neem and rauvolfia, was born in Barabanki, India.

Pandurang Shastri Athavale, the philosopher who founded the Bhagavad Gita–based Swadhyaya movement, was born in Roha, Maharashtra, on this day in 1920.

The German-born Theravada monk and scholar Nyanaponika Thera, co-founder of the Buddhist Publication Society in Sri Lanka, died on 19 October 1994.

Astrophysicist Subrahmanyan Chandrasekhar, born 19 October 1910 in Lahore, derived the mass limit above which a white dwarf cannot support itself, sharing the 1983 Nobel Prize in Physics.