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.
In the epic poem Beowulf, Hrothgar is mentioned as the builder of the great hall Heorot, and ruler of Denmark when the Geatish hero Beowulf arrives to defeat the monster Grendel.