Even diseases have particular smells. Hard to believe? If we look into a thrilling research humans are able to smell sickness in someone whose immune system is highly active within just a few hours of exposure to a toxin. 'There may be early biomarkers for illness in the form of volatile substances coming from the body' explained Mats Olsson of Karolinska Institutet in Sweden. To test this hypothesis Olsson and his team injected eight healthy people with either lipopolysaccharide (LPS) - a toxin known to ramp up an immune response - or a saline solution. The volunteers wore tight t-shirts