It’s tricky to make an exact copy of yourself. Or at least it is for cells undergoing mitosis, where cells replicate everything inside of them, including their neatly packaged DNA, then split in half.

Cells have evolved careful checks to ensure DNA is copied only once, but how they switch on replication at the right moment ...

If you are anything like us, whenever you plan a journey, you spend a remarkable amount of time thinking about the start and ...