Which of these Biofilters are twins - mirror images separated after the first stage of production? Each Biofilter is identified by a number (1 to 3) and a letter (A to D). There are 4 sets of twins in this project. For example, you might agree that Biofilters 1B and 3C are twins. Can you find the others?

Science relies on experimentation, and replication of experimental results is an important part of the scientific process. Recently, problems in studies relating to cancer and neurodegenerative diseases have been highlighted due to a lack of replication of basic laboratory science. This has lead to delays in identifying targets in disease processes and in translating findings from the laboratory to human treatments.


Unless otherwise stated, Sally Hunter reserves the right to be identified as the sole originator of all images on these pages. Copyright © 1996-2026 Sally Hunter