The moment a heart begins to form has been captured in extraordinary time-lapse images for the first time.The footage reveals cardiac cells in a mouse embryo begin to spontaneously organise themselves into a heart-like shape early in development. Scientists say the technique could provide new insights into congenital heart defects, which affect nearly one in 100 babies.“This is the first time we’ve been able to watch heart cells this closely, for this long, during mammalian development,” said th...