Guinea-Bissau suspends a US-funded vaccine trial for newborns following ethical concerns and international criticism.

Scientists at Michigan State University have uncovered the molecular “switch” that powers sperm for their final, high-speed dash toward an egg. By tracking how sperm use glucose as fuel, the team ...

Human newborns arrive remarkably underdeveloped. The reason lies in a deep evolutionary trade-off between big brains, bipedalism and the limits of motherhood.

The vaccination drive has drawn criticism that it might undermine conservation efforts of an animal seen as a symbol of the nation.