Twins Study (IMAGE) London School of Hygiene & Tropical Medicine Caption Identical twins place their hands in a Y-shaped tube filled with mosquitoes to see how attractive they smell. Credit London School of Hygiene and Tropical Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.