Rama Singh, an evolutionary biologist at McMaster University, in Canada, thinks that if women keep having babies later in life, another fundamental reproductive stage ... human woman is born with ...

For some of us, it's a turning point ... In a recent video, he delved into the different stages of human maturity. This is, basically, our babydom — where we're all instinct and sensory ...

Find out about the different stages of a human life cycle and how we change as we grow up. Find out how the skeleton helps us move and protects some of our important organs. How do your muscles work?