When we think of Valentines Day, chubby Cupids, hearts and roses generally come to mind, not industrial processes like mass ...
In 19th-century France, the young chemist challenged the theory of spontaneous generation and discovered an invisible world ...
He noted how the card with the lady and gentleman on the path to the church ... sentiments the cards conveyed – and in the mid-19th century these encompassed a far wider range of emotions ...