In 1951 Viktor Hamburger [4] and Howard Hamilton created an embryonic staging series from a combination of photographs and drawings from other researchers. The Hamburger?Hamilton stages are a sequence of images depicting 46 chronological stages in chick [5] development. The images begin with a fertilized egg [6] and end with a fully developed chick [5]. The Hamburger-Hamilton staging series was...

The introduction of procaine amide for the control of cardiac arrhythmias in man has been recent (Mark et al., 1950). There are relatively few reports at present concerned with it. Those published have dealt chiefly with the use of the preparations of the drug given by intravenous injection and have emphasized its value in arrhythmias of ventricular origin (Mark et al., 1950; Joseph et al., 195...

Legend has it that Keith's introduction to neuroimaging followed a chance encounter in a verdant corner of McGill University. One of us (Alan Evans) found Keith gatheringmaple leaves in the fond hope that variations in their shapewould provide a useful source of data, against which to test his statistical ideas. This was in the late 80s when PET scanners had just started producing images of cer...

From 1951 to 2001, researchers at the University of Oxford [2] in Oxford, England, conducted the British Doctors? Study, a study that examined the smoking habits, disease rates, and mortality rates of physicians in Britain. Two epidemiologists, scientists who study occurrence and distribution of disease, Richard Doll and Austin Bradford Hill, initiated the study, and statistician Richard Peto j...