"Because our lungs regularly deal with carbon dioxide, they see nothing wrong with absorbing its cousin, SiO2, which can be fatal. Many dinosaurs might have died this way when a metropolis-sized asteroid or comet struck the earth 65 million years ago."

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Africa may yet prove to be the spiritual conservatory of the world ... When the civilised nations in consequence of their wonderful material development, shall have had their spiritual susceptibilities blunted through the agency of a captivating and absorbing materialism, it may be that they have to resort to Africa to recover some of the simple elements of faith.

— Edward Wilmot Blyden