The My Favourite Scientist series has thrown up an eclectic mix of subjects.
Famous names like Einstein and Feynman have been among them.
But the latest addition is one I'd not heard of - Pablo Rubinstein.
The Chilean-born scientist has been a pioneer in the use of stem cells from umbilical cords - and the establishment of cord blood banks.
This video was uploaded on the day my first nephew was born - hence the little message at the end!