Over-exposure to certain types of electromagnetic radiation can be harmful. The higher the frequency of the radiation, the more damage it is likely to cause to the body:1  microwaves cause internal heating of body tissues. 2  infrared radiation is felt as heat and causes skin burns.ver-exposure to certain types of electromagnetic radiation can be harmful. The higher the frequency of the radiation, the more damage it is likely to cause to the body:
Hygelac is also mentioned in Beowulf, a long poem in Old English (the language spoken in early medieval England). The poet describes how Hygelac took on the combined forces of Franks, Frisians and âHetwareâ (the âAtt-oariiâ of the Liber Historiae Francorum) and that he died in Frisia. ealdor dugoÃ°e.
Hrothgar appears in the Anglo-Saxon epics Beowulf and Widsith, in Norse sagas and poems, and in medieval Danish chronicles. In both Anglo-Saxon and Scandinavian tradition, Hrothgar is a Scylding, the son of Halfdan, the brother of Halga, and the uncle of HrÃ³lfr Kraki.