How do I … fall in love?

Whether single or in a loved-up couple, Valentine’s Day makes it seem like romance can be conjured up. But it’s all to do with chemistry and biology, say expertsValentine’s Day cometh, that great day of romantic consumerism, in which those who have a partner are reminded to spend money on them and those who don’t are reminded they are alone, surrounded by loved-up couples holding hands and clutching gaudy gifts.
It’s a day to contemplate love itself: what is it? Gre