Deforestation might lead to more deadly mosquito bites. The Atlantic Forest on the eastern coast of South America is home to about 40 different mosquito species. Breakthroughs, discoveries, and DIY tips sent six days a week. If you're someone who mosquitoes just, we feel your pain. Unfortunately, new data indicates the number of mosquito species that feed on humans is increasing--and it's likely to get worse.

Our blood transports many chemicals besides oxygen and carbon dioxide. Some of these molecules provide useful indicators of the state of our health. Indeed, measuring such biomarkers is a common feature of clinical blood tests. Other molecules present, such as hormones and drugs, directly affect health by modulating processes such as metabolism and immune responses. Writing in Nature, Bar et al.1 shed light on the factors that affect the recipe for human blood's chemical brew.