Although this might sound like a set-up to some strange joke, it's actually the recipe for a rare phenomenon, known as 'quaternary twins'. Despite the fact these children don't share a parent ...

Key Lab Eco-Functional Polymer Materials of MOE, Institute of Polymer, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China ...

Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan ...