Against the odds, both survived.
Fact
He good deed can be interpreted as heroic.
Opinion
... it might lead us to draw an opposite conclusion...
Opinion
Various theories can be proposed ....
Fact
He maintains that this view is now generally accepted
Opinion
Pfaff... is convinced that...
Fact
All of which suggests to Pfaff that...
Opinion
Some of the extra neutrons gained are most likely...
Opinion
