Experiments in mice and people find that probiotic supplements don’t consistently change the composition of the gut microbiome, and may have adverse effects after antibiotics.

The function of early hominins’ enlarged brow ridges, and their reduction in size in Homo sapiens, have puzzled paleoanthropologists for decades.

The researchers say that their results are evidence we haven’t yet reached a limit to human lifespan.

DNA analysis gives clues to how the ancient hominin’s population split and how they interacted with modern humans.

From DNA evidence, researchers estimate the split from other species took place between 260,000 and 350,000 years ago.

The sinoatrial node is home to multiple pacemakers that keep the heart beating if the main one falters.

Scientists have identified 40 new genes linked to human intelligence.

Diverse viruses can be found commingling with human and bacteria cells in and on people’s bodies. Scientists are just beginning to understand how these viruses help and when they can turn pathogenic.