How much do you know or trust the fish that you eat, or have you just been taking people's words for granted? Read on to find out more.

Take a guess. Do you think the ratio of male to female in the 7.8 billion human population is close to 1 at all? Read on to explore more.

The males and females of some species can vary drastically in many ways, but they could also be virtually indistinguishable. Why is that so?