Due to the second severe wave of world heavy Covid-19 pandemic in 2021:
Starting in January 2021, The Editor-in-Chief (EiC) of Science Nature decided to limit all the issues in the year with ONLY 2 ISSUES of June and December. Such limited contributions were to decrease the burdens of each scientist who was severely suffered by the world wide pandemics. In this issue of June 2021, the authors are from 2 different countries of Germany and Indonesia.

Published: 2021-12-20

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