The controversial hypotheses in question fall into two categories.

This he interprets as being evidence in favor of the controversial Sapir-Worf hypothesis.

He has studied the controversial hypotheses about the underlying unity among the proposed Nostratic and Eurasiatic language families.

He specializes in Polish 20th century history, and is known for several controversial hypothesis, like those related to the death of general Władysław Sikorski.

One of Greenberg's most controversial hypotheses, it was updated by Ruhlen in 2007.

Previously held assumptions have undergone major revisions, and some new, controversial hypotheses have been developed.

While historically a controversial hypothesis, the debate now is almost entirely political rather than scientific.

Other controversial hypotheses on the origins of these ruins have also been circulated in South Africa:

One controversial hypothesis is that orcas have been eating the otters.

Dr. Whelan's somewhat controversial hypothesis is a possible explanation.