Rosalind Franklin knew exactly what she had.

James Watson's claim that he'd recognised what Franklin had failed to see in her famous photograph of DNA's helical structure was taken at face value in part because she'd left no notes about the image. Researchers have now shown that it's because it was a second photo, taken to correct the centring and contrast of a first—which Franklin had made extensive notes about, and had used "to calculate, for the first time, the length of each turn in the spiral—34 angstroms—and the number of bases 'per turn of helix (if there is a helix).'"

alternative_right shares a report from ScienceAlert: It might be reasonable to think that there's an indelible link between the heart and the body it resides in -- the processes that affect one inevitably affect the other. But a new preprint, uploaded to bioRxiv and yet to be peer-reviewed, suggests that this may only be true up to a point. Take the heart out of the body and put it in a new one, and something incredible happens. The transplanted heart begins to take on the biological age of its new owner. Older hearts transplanted into younger recipients appear to become biologically younger, while younger hearts placed in older bodies show signs of accelerated aging.

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