Unlike humans, the cells nearest the injury "de-differentiated" - they took a developmental step backwards and regained the ability to be converted into various types of specialised heart cells, thus providing the raw materials for the repair of the heart.

BBC: Zebrafish hold clue to mending hearts

University of Maryland biologist Daphne De Freitas Soares and biology lecturer Hilary S. Bierman discovered the guppies' ability while using high-speed videography and digital imaging to analyze the jumping behavior of nine guppies from a wild Trinidadian species, Poecilia reticulata, related to the familiar pet-shop fish.

CNN: After a swimming start, guppies jump, researchers find

This somewhat forced moral structure is made up for by Ms de Loo's rich evocation of life in the Budapest ghetto and by her ability, in pared-down prose, to convey Kata's and Stefan's own confusions and anxieties.

ECONOMIST: Novels from the Netherlands