They began to search actively for the signal, eventually achieving perfect scores in tracking and identifying the correct location of the invisible light source.

BBC: Lab rats 'acquire sixth sense'

So we began actively trying to investigate the whos, the whys, the hows of the whole case.

BBC

Then, about 10, 000 years ago something happened that would change human life: people began to settle down - at first for only part of the year - and actively cultivate crops.

BBC: Road to Riches

She says that since her church began actively welcoming gay members, it has attracted both gay and straight couples, keen to be part of an open congregation.

ECONOMIST: Homosexuality in the Lutheran church