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.
Recent excavations in Oegstgeest and the finding of the unique silver Oegstgeest bowl have brought to light international activities in the Rhine estuary in the early medieval period. As such, this excavation may hold a clue to the location of the bones of Hygelac, who is also mentioned in the Old English poem Beowulf.