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As night fell on Wednesday the truce appeared to be holding, with UN chief Antonio Guterres describing it as the “first ray of hope for peace amid the darkness of the past months”.

This led them to develop a computational method for quantifying the life-death boundary, which they call "stoichiometric rays."

The floor of the mobula ray's mouth is lined on either side with parallel, comb-like structures, called plates, that siphon water into the ray's gills.

A gamma ray detector on a device developed by a Cornish company is being used to assess soil quality.

The gamma rays detected on Earth tell us a great deal about these sources, since they travel through space undisturbed.