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.
Beowulf and the Scyldings. House of Hrethel. On his mother's side, Beowulf belonged to the royal house in Geatland, which is a kingdom in southern Sweden. His maternal grandfather was King Hrethel. Note that the name of Beowulf's mother is not given in the story, but she is the daughter of King Hrethel and sister of King Hygelac. On his father's side, Beowulf belonged to a lineage, known as the WÃ¦gundings, a noble house of warriors. His father was named Ecgtheow.