Candles are useful for many things; light, for instance, they can also make a room smell nice, and they can definitely set the mood, but we are not setting the mood today. We are going to do science ...

Casting a swirling shadow, a glowing candle flame sways eerily before flaring up once more. As ghostly as it looks, this flame dance is not the result of any force—paranormal or otherwise—but rather ...