Puzzle

A block of metal emits oxygen. Illustration by Avi Blizovsky, using DALEE The illustration should not be seen as a scientific image.

The dark oxygen puzzle

Natural lumps of metal emit oxygen in the dark depths of the ocean, in the absence of photosynthesis, until now it was believed that there was no oxygen production in them at all
The works in the ancient canal. Photo by Emil Eljam, Antiquities Authority

A mystery in Jerusalem: What were the mysterious canal facilities from the days of Kings Jehoash and Amaziah that were uncovered in the City of David National Park used for?

The canal facilities, the likes of which have not yet been discovered in Israel, were in use about 2,800 years ago - during the time of the First Temple; According to the researchers from the Antiquities Authority and Tel Aviv University, "it is possible that the canals were used to soak some product. the location