Yesterday & Today #History: 1922 The #Federation of #American Societies for #Experimental #Biology advanced understanding of #tissue fibrinogen (blood clotting) following the work of #German physiologist Paul Morawitz in #studying the #coagulation of blood. Today blood-thinning #medications are used to #prevent blood #clots & electrocauterization (electricity used to heat & seal tissues) or ligation (tying off blood vessels).