Niels Bohr - Biographical. Niels Henrik David Bohr was born in Copenhagen on October 7, 1885, as the son of Christian Bohr, Professor of Physiology at Copenhagen University, and his wife Ellen, nÃ©e Adler.
Opuntia is a large genus of plants native to North America and South America. All have succulent stems, some of them becoming woody with age. Stems may be cylindrical or flattened pads. Tiny, succulent leaves may be present on the newest growth (see photo below.) Most species are spiny.
As invasive thistle plants became a recognized problem in North America, suppliers shifted to a daisy-like plant, known as Guizotia abyssinica, that produces a similar type of small, oily, rich seed. The plant is now known as niger or nyjer, and is imported from overseas.