![A man in a wheelchair with his dog.](https://imagenes.elpais.com/resizer/v2/2H3BGLQNDNGWRCKNIAHTFQNN3M.jpg?auth=3cab5cb5716b740dfa16065a16c6d152e82821590f6387dd60781ae9260cfc09&width=414&height=233&smart=true)
Science vindicates dogs as sentinels of human health
Researchers point to the need to establish a program among vets that might flag up epidemics among humans
Researchers point to the need to establish a program among vets that might flag up epidemics among humans
A new study has discovered that artificial lighting confuses the orientation system of flying insects, who use sunlight to guide them
The discovery of the insects has raised more questions about the history of the evolution of hematophagy
From Mexico to Brazil, cases of dengue have increased. Climate-related factors have provoked an epidemic in the region