Science

Some people are allergic to others – but the mystery of how this works is only just starting to be unravelled.

A new programme using a form of horse therapy is attempting to tackle the trauma that is thought to lie behind the high rates of arrest and imprisonment among US veterans.

There are huge gaps in what we know about sperm, from how they navigate to why sperm counts are tumbling. The BBC unravels why we know so little about this perplexing cell.

Trillions of bacteria, fungi, viruses and single-celled organisms travel the globe high in the atmosphere. Scientists are finding that they play a role in the weather and our health.

The speed at which you walk can reveal profound insights into your brain's rate of ageing – with slower walkers having smaller brains and fundamental differences in crucial structures.

Marie Curie worked with radioactive material with her bare hands. More than 100 years later, Sophie Hardach travels to Paris to trace the radioactive fingerprints she left behind.

An ambitious project to weaken or divert hurricanes generated decades of suspicion and disagreement. What did we learn – and will it ever be revived?

Seed oils like canola and sunflower oil have attracted controversial claims about harmful effects in recent times. Is there any truth to them?