An American horseback tour operator was allegedly killed by her ex-boyfriend while working on a Caribbean island, according to authorities and reports. Karen Johannsen, 66, was violently struck in the ...

An American horseback tour operator who spent her days leading guests along Antigua’s picturesque shoreline has died after a brutal assault earlier this month. Karen Johannsen, 66, of Madison, ...

You have full access to this article via your institution. Finally, in our paper we explain how the change in bonding takes place when net magnetism is absent in the crystal, compared with the ...