When I was a kid, my family spent most of our summer at a cabin in the northern part of our state. Inevitably, one of my sisters and I would be covered in mosquito bites, while the rest of the family escaped that itchy fate. My mom used to say that my sister and I had "sweet blood." Turns out, she wasn't too far off base.

Among other factors, tiny little blood-suckers such as mosquitoes are drawn to the carbon dioxide and lactic acid we excrete. While we all release carbon dioxide and lactic acid larger people and pregnant women have higher amounts. You're also likely to have a higher level of lactic acid in your sweat just after exercising. High body temperature is also a beacon to mosquitoes. Floral scents (perfumes, etc.) may also be a draw as well as dark colored fabrics.

Kelly at Green Daily has some earth-friendly tips for fending off mosquitoes.