Someone is testing the effectiveness of a mosquito repellent bracelet, putting his hand in a box full of 200 tiger mosquitoes (Aedes aegypti), one of the most important carriers of yellow fever. The bracelets are supposed to repel mosquitoes thanks to the essential oils. Result: mosquitoes are not repelled at all by the bracelet and the hand receives countless stings. A video from the company Biogents.