Here are the clues and answers to NYT's The Mini for Thursday, Feb. 26, 2026:
TST_DES_CALL (0x15) -- used by far CALL to classify the target descriptor:
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Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.