Front Cover:
"An almost motionless butterfly glistening in the sun; shinning with mirrors on its wings." Picture by Manu Prakash of Foldscope: the origami microscope, https://microcosmos.foldscope.com.

Back Cover:
Structure of human hemoglobin. The proteins α and β subunits are in red and blue, and the iron-containing heme groups in green. From PDB: 1GZX Proteopedia Hemoglobin, courtesy Wikipedia

Front Inside Cover:
cartoon

Back Inside Cover:
The Very Large Telescope (VLT) at Paranal in the remote, sparsely populated Atacama Desert, Chile, operated by the European Sourthen Observatory. The world's most advanced ground-based facility for astronomy, the site hosts four 8.2-metre Unit Telescopes, four 1.8-metre Auxiliary Telescopes, the VLT Survey Telescope (VST), and the 4.1-metre Visible and Infrared Survey Telescope for Astronomy (VISTA), seen in the distance on the next mountain peak over from the main platform. This aerial view also shows other structures, including the Observatory Control Room building, on the main platform's front edge.