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The provided articles cover two distinct scientific developments and cannot be aggregated into a single news story.

Researchers at the University of Bonn in Germany successfully used direct reprogramming to reduce the molecular age of blood cells from an 80-year-old individual to an estimated age of under 20 years. Led by Professor Oliver Brüstle, the team converted red blood cell precursors directly into neural stem cells. This experimental method allows for the observation of molecular changes over time using epigenetic clocks, though it is intended for studying aging mechanisms rather than as a human rejuvenation treatment.

Separately, scientists from the Korea Advanced Institute of Science and Technology (KAIST) and the Hong Kong University of Science and Technology have developed a flexible cap designed to combat hair loss. The device uses near-infrared light via organic light-emitting diodes (OLEDs) to target dermal papilla cells. In laboratory tests, the technology reduced the activity of an enzyme linked to cellular aging by 91.6%. The device has not yet undergone human testing.