There's a common belief that all mothers are inherently good. But these two women have something to say about that misconception. Amelia Dyer ran a business where the more kids she killed, the more money she made. Mary Ann Cotton found that it was hard to support all the extra mouths to feed as a working woman, so she poisoned her family. And for years, authorities were none the wiser. Learn more about your ad choices. Visit podcastchoices.com/adchoices