At the World Athletic Championships in Beijing, cameraman Song Tao interrupted Usain Bolt's 200m victory lap, knocking the world's greatest sprinter clean off his speedy feet with a misjudged lean against an unseen barrier.
While the phloem limits the fruit's rate of growth, some other factor may finally kick in to stop it growing at a certain size, an unseen barrier that extreme fruit breeders will be keen to test.
This has fed a fear of rising social inequalities, and the feeling that unseen barriers are preventing new talent, new ideas —literally, new blood — from entering politics, and from helping Japan find a way out of its morass.
"White Americans need to do a better job at listening when African Americans talk about the seen and unseen barriers they face every day.
Fear of rejection by the journals, uncertainty about which journal would be best to publish research, a lack of the culture of publication, competing clinical commitments, different ministry and donor driven agendas for research, are some of the unseen barriers facing developing country researchers (10).
The thing is, the glass ceiling – as defined by the Federal Glass Ceiling Commission in 1995 – is "the unseen, yet unbreakable barrier that keeps minorities and women from rising to the upper rungs of the corporate ladder, regardless of their qualifications or achievements".
The armed man, in his 40s and described as heavy set, pumps the shotgun as he aims it at the employees, who remain mostly unseen behind a barrier displaying menu items.
For those constrained by a barrier of unseen sights and unheard sounds, it was once unexplored territory – but with the Lorm glove, they might just have that world in the palm of their hands.
A barrier exists unseen and unnoticed.
For the most part, their journeys pass unseen, until they hit a barrier – the English Channel; the lines of police at Ventimiglia on the Italy-France border; the forests of Macedonia – that creates a bottleneck and leads to scenes of destitution and chaos.
13 These models are useful in helping us step back from the day-to-day practice of science to reflect on that practice in a more deliberative way, with an eye to identifying choke-points, barriers, and also unseen opportunities for improvement and greater health impact.
