the author writes that "It's perfectly permissible for Haredim to write on the sand on Saturday..." this is inacurrate. There is no Biblical prohibition however it is forbidden Rabbinically. As #7 wrote these inventions are used for hospitals and the like - where there is a need for doing actions not normally allowed on shabbat - but we want to minimize the violations.
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Hungarian police detain two suspects in murder of Israeli tourist Ofir Gross (Haaretz)
from the article: How to be religious - and enjoy a Shabbat espresso